Sightmark Laser Bore Sight .50 Cal Green. You can use them on shotguns handguns rifle scopes and adjustable iron sights The caliber-specific laser boresight fits into your firearm s chamber and emits either a red laser or green laser (depending on which model you choose). The laser then appears as a green or red dot on your target. From there all you have to do is adjust the windage and elevation of your rifle scope or other optic systems until you re pointed at the bullseye. Remove the laser boresight from your firearm and proceed with using live ammunition. It may take some minute adjustments on your scope and up to 3 shots but you ll be dead-on after that Shooters love these laser bore sighter kits from SightMark. Choose from popular calibers like .223 Remington/5.56mm NATO .45 ACP 9mm Luger and more In over 30 different available calibers you can find them as small as .17 HMR and all the way up to 12-gauge shotgun Specifications for Sightmark Laser Bore Sights: Manufacturer: SightMark Included Accessories: Battery pack/Carrying case Limited Lifetime Warranty Battery Pack Standard Carrying Case Fabric/Material: Brass Battery Type: AG5 AG3 Finish: Brass Color: Brass Gun Model: Universal Additional Features: Precision accuracyReliable and durableFastest gun zeroing and sighting systemreduce wasted cartridges and shellsCompact and lightweightEasy to pack and travel Standard Battery Quantity: 3 Features of Sightmark Laser Bore Sights: Precision accuracy Reliable and durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Compact and lightweight Easy to pack and travel Limited Lifetime Warranty Package Contents: Sightmark Laser Bore Sights Battery Pack Carrying Case SM39038: Sightmark Laser Bore Sight - .50 Cal Green