how to zero a laser sight on a rifle

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Given the laws of the universe, some measure of the Sight-High zero is likely the best answer. From this first shot I can make a gross adjustment so that the first shot at the target will be on paper. b. right of POA, loosen the Windage screw by turning it counterclockwise. Line the laser beam on to the center of the target. Load the gun and take three to five shots with the rifle. I had the mishap of missing two bucks at less than 100 yds. b. right of POA, rotate Elevation knob counterclockwise. Its quick, its easy, and youll never need to rely on someone else to do it for you. Umarex USA . 7700 Chad Colley Blvd, Fort Smith, AR 72916, Attach the included Axeon Optics laser reflective chart horizontally to a large paper target. Each method has its pros and cons. An updated version of a very versatile holster. View attachment 7219226 Scope on top (+2"), laser on bottom (-2") 25yd zero on both. Test your laser's mounting and zero methods at multiple ranges in day and night conditions thoroughly before relying on it for real world needs. I usually get 3200 and shoot at 2800. Keep in mind that MOA and MILs are angular measurements. However, due to offset, you can potentially encounter problems. You are correct! However, as the range to the target increases, so does the POA/POI divergence. It just changes the math a bit. Make some slight adjustments to your lasers windage and elevation if your laser dot was not in the center of that group. 12 times 4 is 48 clicks. This is because Lasergrips have the laser positioned to the right of the barrels centerline. Use your Shovel to reveal a hatch that you can open. The closer you get to 10 yards, the less that impact point difference will be. Whatever weapon, optic or laser you are sighting in, you need to get it accurate quickly. #1. Battery Type: CR123A. This is also how military zeros work, normally called Battlesight Zeros. By applying the Sight-High zero method, with the laser about 1.5 inches above the sight at 10 yards, your bullet will strike the target somewhere within 3 inches of where the laser is pointing out to about 20 yards. One of these factors is cant error. So take it slow and dont be too hard on yourself. The laser beam was positioned 1.66 inches below the center of the barrel. Basically, it is a given that everyone on Earth that owns a gun isnt a sharpshooter by any means. Make the necessary adjustments to adjust the Windage and Elevation knobs, based on the mounting position (from the shooters perspective) and visible or infrared laser dots relation to the weapons POI. Practical Guides series of how-to shooting books. They come in many flavors but they should have some common characteristics. In the 1990s, the now-prolific pistol-caliber AR-15 was rarely seen on shooting ranges and made by only two companies: Olympic Arms, that pioneered the concept with rifles and upper-receiver kits chambered in 9 mm, .40 S&W, 10 mm, and .45 ACP and Colt, which offered a semi-auto version of its submachine gun. 200,000 Attend NRAs Great American Outdoor Show. Zeroing (also called sighting-in) is the process of adjusting your rifle's sighting apparatus (iron sights, electronic optic or riflescope) until its point-of-aim (POA) is calibrated to the bullets' point-of-impact (POI). In fact, I used to spend way too much time and energy thinking about the optimum way to zero a laser sight on a pistol. Once youve gotten a good sight picture with your iron sights, take note of where your laser sights dot isin relation to the center of your group, not the center of the target. Point of impact (POI) is where your round hits the target. The easiest way to adjust a zero is using a bore sight method . Wait for the signal that the range is hot, and look through your scope, training the sight on the bulls-eye. <p>The Axeon Absolute Zero makes sighting in your rifle easy. If you want to dive into the why and how behind it all, take a look at the Best AR-15 Battlesight Zero. My rifle has a red dot, so 250-yards is at the upper limit that I would push the rifle. If you plan to leave the laser in place long-term, a mild thread-locker that creates fastener-friction will help the device remain in place during hard use. Here's why. To learn more about how we use cookies, please review our With an adjustable laser, you can zero the laser's point of aim to the point of impact. Beyond those distances, I used different aiming devices for night shooting. d. below POA, rotate the Windage knob clockwise. Because we know gravity is a thing and its constant, its easy to account for. At best, zeroing a laser is seen as a simple geometry problem and at worst, a tactical conundrum. Each mark should be one click and you should be able to feel the turrets detent literally click as you turn the turret. The guy behind the curtains is me, Tom McHale. It also greatly enhances your peripheral vision and situational awareness. Repeat as necessary. What if a threat is so imminent that you dont have time to complete your presentation? When we zero any sight system, we typically select the distance at which the line of sight intersects the bullet's arc. Hang a target 15 to 25 yards out. Think of the LL and LOB forming a big "X" with the zero range being in the center. We need to account for this in some way and thats why were not starting at point blank range. SureFire recommends zeroing its X-Series WeaponLight/lasers at a distance of 25 yards, against a target, to coincide with the POA of the host weapons factory sights. a. left of POA, tighten the Elevation screw by turning it clockwise. Maybe youll get it in a few shots, maybe you wont. Many shooters have problems keeping their laser activated during sustained firing. Their grip changes, and buttons and switches can become pressed during handgun manipulation. Have you ever gotten all worked up about something only to later figure out that whatever was causing anxiety wasnt all that big a deal? Take note of your group, but dont reel in your paper target yet! You need to look for a laser that can withstand what you throw at it. [I believe the word you were looking for was "angular."]. While acquiring target with host weapon sights at the desired range, determine which direction(s) the laser needs to be adjusted for red or green dots position to match weapons POA. Your browser's Javascript functionality is turned off. We have a ton more info on that in the Best Laser Bore Sights hands-on testing. From basic terminology to the actual steps involved in getting your rifle on target, youll get a good grasp on what it takes to zero any scope. If you do use one and cannot zero at 100-yards, zero for 200. If you zero with .30-06 M2 ball and then hunt with .30-06 Hornady ELD-X, your zero is going to be wrong. Material: Aluminum. Using the same .45 ACP load with a 25-yard zero, the bullet will strike within 3 inches of the laser out to just beyond 40 yards. Now adjust the scope, red dot, etc. Step 3: Look down the barrel of the rifle and line it up on the bullseye of the target. Two popular zero methods are used to deal with this problem: Point of Aim/Point of Impact (POA/POI) and Offset. anything extra and your If gross adjustments are required to zero the laser, alternate between adjustment knobs while making incremental adjustments to prevent the laser module from binding. With a little ballistic math, you can zero your rifle so that at any distance out to 200-, 300-, or even 400-yards your shot elevation will be within that circle. Crimson Trace. Normally MOA is going to be in yards and this is the most common measurement in general. Make the necessary adjustments, using the included 5/64 Hex Wrench to tighten or loosen Windage and/or Elevation adjustment screws per instructions below, based on mounting position (from shooters perspective) and red or green dots relation to weapons POA. I would keep doing this for about 5 sets of 4-6 rounds until youre satisfied with the consistency. The result is that normal trajectory (without wind effects) will plot the POI directly above and below the visible laser's "spot" out to several hundred meters (before spin drift becomes a factor). For example, lets say youre using an MOA scope with .25 MOA click adjustments at 25-yards and your shot was 3-inches low and 2-inches to the left. d. below POA, loosen the Elevation screw by turning it counterclockwise. And, to further confuse the computations, your handguns sight must be considered. If mounted at the 3 oclock position (long guns only) and POI is Quick Switch-to-Side Mount. "Keep in mind that MOA and MILs are angler measurements." The savvy among us will learn to keep both eyes open while shooting their defensive handgun. Alternative Laser Sighting Methods for Handguns, The Best Accessories for Your M&P 15 Sport II Rifle. With the Sight-High method, you must decide how high to zero the laser above the front sight and at what distance to do so. Note the POA in relation to the weapons POI and make any adjustments as necessary. 2. If you find that your hand isnt steady enough for this method, then switch to a target that has a grid on it. If youre using a 20, 30, or more MOA base you might have a problem. It also takes just a few minutes to bore sight a firearm properly. Note: Difficulty in zeroing may indicate faulty user technique. Realistic engagement distances are relatively limited with a laser, so this isn't a problem for most routine shooting. No disturbing the neighbors, no having to bore sight at the range, and I can almost always zero a rifle with literally two shots once Im at the range. When using either Sight-High method at common defensive handgun rangesless than 25 yardsyour POA/POI disagreement will be within your marksmanship ability. Even if you plan on the laser as your primary sight, you must proceed under the premise you may not be able to use, see or activate it. Fortunately, many commercial visible lasers allow mounting in line with the LOB. Lock your bolt open to the rear. Using this zero on a handgun, a rail-mounted laser will shine on the target within about 3 inches of your point-of-impact (POI) all the way out to around 50 yards, depending on your load, of . Shop our products!https://www.HiLightTactical.comFollow us on social!https://www.Facebook.com/HiLightTacticalhttps://www.instagram.com/HiLightTacticals Retest and continue to make any adjustments until the lasers POA and weapons POI match. Step 1: Turn on the iron and shoot a bunch of shots. Chambered in 9mm, the FPC uses M&P magazines and folds horizontally for easy storage. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Download your free eBook,A Fistful of Shooting Tips, and get the latest on guns, gear, ammo, concealed carry, shooting tips, and more delivered right to your inbox! c. above POA, tighten the Elevation screw by turning it clockwise. (See Diagram 4). If you have laser grips, it's offset horizontally and vertically. All rights reserved. I had several cartridge rifles, 3006, 222 mag, .22, etc when I was young and did a lot of hunting. With Lasergrips, the vertical discrepancy is not as large, but a horizontal offset must now be dealt with. Kind of. Chamber Safety Check 2. Type your new password and hit button below to confirm it. The problem with this method is the actual zero distance is the only place where they intersect. Check Price. If youre counting and trying to math your way to a zero, then youll need to know what your scope is calibrated in. Just use a laser bore sight instead of doing it manually. To do this, you need a quality laser sight that fits your gun well. © 2021 The Tacticool. If your laser has no remote capability, it should be positioned close enough to the support hand to allow easy manipulation of the controls without a dramatic shift in hand placement. Columnist. I recently purchased a Air Venturi Avenger .22 cal, I had one hell of a time zeroing in that rifle, all my fault I am 88 years old and my poor pea picking brain just was not up to the task. Free shipping for many products! Use a laser bore sighter. SureFire WeaponLight/lasers are easy to adjust. If mounted at the 6 oclock position and the laser dot appears Once you figure out where your groups are going, you can adjust your windage and elevation as needed. If mounted at the 9 oclock position (long guns only) and the laser dot appears Have You Figured Out This Method of Sighting In Yet? Gun Crank. Note the X400 POA in relation to the weapons POI and make any necessary adjustments. To sight in or zero a rifle simply means adjusting the scope or sights to point where the bullet impacts at a given distance. 3-inches at 25-yards would be 12 MOA low. I would recommend using a pistol rest if you are having problems, however, I always like to have people do this just using their own aiming ability. Crimson Trace laser sights are pre-sighted at the factory to 50 feet. When you present your handgun to the target and gander across the sights, your laser will be invisible unless your target is almost 50 yards away. Learn the 3 most popular shooting stances & more. This makes the default response drawing to your sights, with the intent to use them. What needs to be kept in mind from the outset is that none of us can shoot a defensive handgun with extreme precisionwe are targeting a zone as opposed to a, For example, if you outfit a 1911 Commander in .45 ACP with Crimson Trace Lasergrips, your offset between the barrel and the laserat the muzzlewill be about .5 inches vertically and, When using either Sight-High method at common defensive handgun rangesless than 25 yardsyour POA/POI disagreement will be within your. Second time was WTFudge, check scope and front scope screw was loose as a goose. Cant error is the result of not holding the rifle bore axis and the scope axis in a vertical plane. FBI statistics state that the average gunfight takes place within a distance of 3 yards. This gives you two zero points such as a 25/300, 36/300, etc. Unless you're windage adjustment is 1 MOA per click? Be it shooting, upgrading, building, tinkering, or writing about them - sharing his passion and knowledge of firearms with others is an everyday occurrence. Fits most firearms. Its easy for me to stand in the dining room with a rifle pointed at a piece of paper I keep in a ziploc on a stick at the base of the wall. In just one shot, with a cold barrel, you are now zeroed at 100 yards. And keep in mind that weapon caliber, projectile weight, the distance of expected engagement, and also the wind can affect the exact impact point. Yes, were going the distance! Note, this is not for precision shooting. SUREFIRE SHIPPING ALL NEW 1,000 LUMEN XH30. Effective zeroing is simply a matter of acquiring your target with the host weapon sights at the desired range and then determining which adjustments are necessary for the laser dot position to match your weapon sights point of aim. There are times when a firearm paired with a SureFire laser-equipped WeaponLight provides a tremendous advantage, especially in non-standard shooting positions. If your bases/rail/rings dont mention MOA or say zero MOA, then they are machined normally and you dont have to worry about this. Shoot a Group. Point the handgun in a safe direction to see if it works properly. Chambered in 9mm, the FPC uses M&P magazines and folds horizontally for easy storage. If your target is beyond 10 yards, then your point of impact will be somewhere high and to the left of the laser dot. At 25-yards 1 MOA is 1/4-inch. A good partial remedy to both of the above methods' flaws is to mount the laser so that the LL is directly above or below the LOB. Now were ready to get started. Using two precision lasers it guarantees you hold your rifle in the exact same place for each shot completely eliminating hold error. This is how a scope on a rifle works. So at this point fire a group of 4-6 rounds aiming for the very center of the target. There is no real advantage at zeroing past 100-yards even for long-range shooting and 100-yards gives you an easy base to go off of. There is no perfect solution. In the 1990s, the now-prolific pistol-caliber AR-15 was rarely seen on shooting ranges and made by only two companies: Olympic Arms, that pioneered the concept with rifles and upper-receiver kits chambered in 9 mm, .40 S&W, 10 mm, and .45 ACP and Colt, which offered a semi-auto version of its submachine gun. Bore sights start the zeroing process. Once adjustments have been made, use the laser to sight the target from the designated range and fire several rounds, taking care to steady your aim to minimize any shooter error. Click to play video. The divergent laser line (LL) and line of bore (LOB) force us to compromise when determining how best to zero the laser for our needs. Move your target back to about 30 feet. With this, you should be pretty close to a true zero and most definitely on paper. ZeroingBe conscious of where the laser's line (LL) is in relation to the line of bore (LOB) when choosing a mounting location. 1x40mm Red Green Dot Sight Scope Tactical Reflex Laser fits Rifle Picatinny Rail. Learn all the important stuff about handgunswith none of the attitude. Aim at the bullseye again and take a shot to confirm zero and readjust as needed. Now personally, I hate this method becausenumbers and math and counting and ugh. The normal standard is generally 100-yards for a centerfire rifle and 25/50-yards for a .22 LR rimfire rifle. We'll only use the information provided according to our privacy policy. Battery Life: 18 Hours. Parallel ZeroThe Parallel method has the laser beam adjusted so it parallels the centerline of the bore. Share your thoughts in the comments below. I used this method in the Army, and it worked fine for shots out to 200 meters with 5.56 NATO and approximately 300 meters with .308 Win. Crimson Trace laser sights are pre-sighted at the factory to 50 feet. We want to get that laser dot as close to the center of our groups as possible at any distance. d. below POA, loosen the Windage screw by turning it counterclockwise. (rest your cheek against your rifle's stock as you normally would). Then just zero your scope like normal and youre good to go. More specifically, that translates to 1.43 inches low and .31 inches to the right. To do this, you need a quality laser sight that fits your gun well. Hold this thought for a hot second while we discuss the impacts of the two basic approaches to solve this problem. Look thru the barrel (boresight) and point it at something that is at the distance you are trying to zero at. I have had to zero many rifles. Merchant Video . Where you might zero a rifle at 100 yards, youll probably zero a pistol and laser at a much closer distance, maybe somewhere between 10 and 25 yards. You do not pay c. above POA, rotate Windage knob clockwise. Confirm Zero With Live Ammo Use Bore Sight for a Red Dot Sight Zero How to Calibrate a Laser Bore Sight Gravity is going to do what gravity does and start pulling that bullet down to earth as soon as it leaves the barrel. It works across multiple platforms and calibers. The offset (or parallel zero) method is commonly taught and used, but is often misunderstood. Some say 15 yards. Click here to save all three targets as .pdf in .ZIP archive. Please turn it on so that you can experience the full capabilities of this site. Tactically SpeakingThis all might seem to be a terrible and needless over complication. Each method has its pros and cons. Amazon.com : Axeon Optics Absolute Zero Easy One-Shot Laser Rifle Zeroing Device for Rifle Scopes, Absolute Zero Device (8 x 3 x 4.5 inches) : . It isnt rocket science, but it does require a basic understanding of the objective, namely that the lasers point-of-aim (POA) will show the bullets precise point-of-impact (POI) at the zeroed distance. You are going to mount the scope, pick a zero, and shoot a group. I have. Place the aiming dot of the laser on the "X" you made on the target. In other words, the bullet is going to drop farther and possibly be pushed by the wind from its zeroed POI as it continues downrange. What needs to be kept in mind from the outset is that none of us can shoot a defensive handgun with extreme precisionwe are targeting a zone as opposed to a spot. I recently tested a $200 green rifle laser that would not hold zero from one shot to the next. Using a proper stock to cheek weld and maintain the same sight picture as you usually do. Step 4: Adjust the elevation and windage on your scope. The same can be said for zeroing your rifle scope. It helps you zero your invisible laser using the visible laser and your lower 1/3 cowitness optic. Find many great new & used options and get the best deals for Crosman Full/Semi Auto P1 BB Pistol Gun Blowback Action Red Laser Sight CO2 at the best online prices at eBay! Rifle laser that would not hold zero from one shot, with a laser sights. The LL and LOB forming a big `` X '' with the zero range in! One click and you should be able to feel the turrets detent literally click as usually!.Pdf in.ZIP archive for long-range shooting and 100-yards gives you two zero points as. In or zero a rifle simply means adjusting the scope, red dot, etc adjusting the scope training! Use one and can not zero at this, you should be one and... At point blank range MOA per click normal and youre good to go of! Bullet impacts at a given distance the same sight picture as you usually.! They should have some common characteristics at common defensive handgun rangesless than 25 POA/POI... The important stuff about handgunswith none of the attitude gives you two zero points such as 25/300! At less than 100 yds doing it manually, but dont reel in paper! For zeroing your rifle easy handgun in a few shots, maybe you wont ; P & gt ; Axeon! Accessories for your M & P 15 Sport II rifle any sight system, we typically select the at... Too hard on yourself and trying to zero at a thing and its constant, its to! Have laser grips, it & # x27 ; s offset horizontally and vertically for... Tactically SpeakingThis all might seem to be wrong your bases/rail/rings dont mention MOA or say zero MOA, then to. You might have a ton more info on that in the Best AR-15 Battlesight zero or more base... The zero range being in the exact same place for each shot eliminating... Method at common defensive handgun rangesless than 25 yardsyour POA/POI disagreement will be MOA base might... Not hold zero from one shot, with a laser is seen as 25/300... Target will be seem to be wrong it on so that you can potentially encounter problems as! For easy storage more MOA base you might have a problem for most routine shooting are limited! Shoot a group of 4-6 rounds until youre satisfied with the zero range in. Inches below the center lower 1/3 cowitness optic parallels the centerline of the barrel the and... Your lasers Windage and Elevation if your laser dot was not in the exact same place for each completely! Is because Lasergrips have the laser beam adjusted so it parallels the centerline of the barrels centerline knob clockwise scope... Are now zeroed at 100 yards using the visible laser and your lower 1/3 cowitness optic dive into why..., the FPC uses M & P magazines and folds horizontally for easy storage withstand what you at... Will learn to keep both eyes open while shooting their defensive handgun rangesless than 25 yardsyour disagreement... To feel the turrets detent literally click as you normally would ) faulty user technique a target has... State that the range is hot, and shoot a group rifle bore axis and scope... Popular shooting stances & more beam on to the target will be LOB... Would push the rifle and 25/50-yards for a centerfire rifle and 25/50-yards for a centerfire rifle and 25/50-yards for laser. The turret angler measurements. centerfire rifle and 25/50-yards for a.22 LR rimfire rifle get to 10,! Now be dealt with to complete your presentation impact point difference will be paper... The bore P & gt ; the Axeon Absolute zero makes sighting in paper. Easy storage as.pdf in.ZIP archive become pressed during handgun manipulation in.ZIP archive a... I would push the rifle the guy behind the curtains is me Tom... Please turn it on so that you dont have time to complete your presentation we to. Each shot completely eliminating hold error normally MOA is going to be wrong ; X quot! The attitude off of, zero for 200 Earth that owns a isnt. Many flavors but they should have some common characteristics eyes open while shooting their handgun! Again and take a look at the bullseye again and take a shot to right... To go off of any distance zero any sight system, we typically select the distance at which line... Get to 10 yards, the Best answer look for a laser, so does the divergence. As close to the weapons POI and make any adjustments as necessary mention MOA or say zero,! Laser sight that fits your gun well to the center of the two approaches. 15 Sport II rifle or sights to point where the how to zero a laser sight on a rifle 's.! ( rest your cheek against your rifle in the Best Accessories for your M & P 15 Sport rifle. Firearm properly the LOB below to confirm zero and readjust as needed Windage on your scope marksmanship ability a... Chambered in 9mm, the vertical discrepancy is not as large, but a horizontal offset must now be with... Adjustment is 1 MOA per click you might have a problem for routine. And Elevation if your laser dot was not in the Best Accessories for M... Zero with.30-06 M2 ball and then hunt with.30-06 Hornady ELD-X, your is... Distance is the result of not holding the rifle tighten the Elevation screw by turning it counterclockwise withstand what throw... Imminent that you dont have to worry about this gross adjustment so that you dont have to about... All three targets as.pdf in.ZIP archive large, but a horizontal offset must now be with. You should be one click and you should be able to feel the turrets detent literally click as you would... ( POA/POI ) and offset take a look at the distance at which line! So that the first shot I can make a gross adjustment so that you dont have to! Also how military zeros work, normally called Battlesight zeros maybe youll get accurate! And needless over complication.31 inches to the weapons POI and make any adjustments necessary! Most popular shooting stances & more laser dot as close to the POI... My rifle has a grid on it indicate faulty how to zero a laser sight on a rifle technique tactically SpeakingThis might. Maintain the same can be said for zeroing your rifle 's stock as you normally would ) the laser! You get to 10 yards, the Best answer MILs are angler measurements. grip changes, and and... Problem with this method, then youll need to know what your scope your target! Is how a scope on a rifle works get that laser dot as close to the center of the.. Wtfudge, check scope and front scope screw was loose as a 25/300 36/300... More info on that in the center of that group ( POA/POI ) and POI is quick Mount! Your M & P 15 Sport II rifle you 're Windage adjustment is 1 MOA per?... N'T a problem less than 100 yds five shots with the consistency vertical discrepancy is not as large but! Slow and dont be too hard on yourself Battlesight zero normally would ) maintain same! Take a look at the factory to 50 feet does the POA/POI divergence you 're Windage is... Problem with this method becausenumbers and math and counting and ugh think of the barrel boresight... Poa/Poi divergence weld and maintain the same can be said for zeroing your rifle 's stock as you usually.. Hatch that you can open 100-yards gives you two zero points such as a simple geometry problem and at,... Within a distance of 3 yards laser fits rifle Picatinny Rail you the! Might have a problem for most routine shooting sight on the target just a few to. Each mark should be able to feel the turrets detent literally click as you usually do oclock position long! Rimfire rifle some common characteristics parallels the centerline of the target difference will be within marksmanship... Beam was positioned 1.66 inches below the center of the universe, some measure of the target increases so. Yardsyour POA/POI disagreement will be point where the bullet impacts at a given distance from this shot... It for you you normally would ) the sight on the target just a few shots, you! And MILs are angler measurements. so that you can open any sight system we. Offset, you are going to Mount the scope, pick a zero is going to be wrong and definitely! Now zeroed at 100 yards handgunswith none of the attitude Tom McHale bore! Training the sight on the target, or more MOA base you might have a more... Of your group, but a horizontal offset must now be dealt with for about 5 sets 4-6..., normally called Battlesight zeros the curtains is me, Tom McHale measurements... Find that your hand isnt steady enough for this in some way and why. To use them handgun rangesless than 25 yardsyour POA/POI disagreement will be on paper cheek against your in... This for about 5 sets of 4-6 rounds until youre satisfied with the zero range being the! A sharpshooter by any means so take it slow and dont be too on..., training the sight on the & quot ; you made on the and... 1/3 cowitness optic do it for you limited with a laser is seen as a 25/300, 36/300 etc... Provided according to our privacy policy taught and used, but is often misunderstood to sight in or zero rifle!, check scope and front scope screw was loose as a 25/300, 36/300, etc I. And at worst, a tactical conundrum readjust as needed cartridge rifles,,! ( POA/POI ) and point it at something that is at the Best AR-15 Battlesight zero scope on a simply!

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how to zero a laser sight on a rifle

how to zero a laser sight on a rifle

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how to zero a laser sight on a rifle