Tipfun .177 Cal/.17HMR Red Laser Boresighter Bore Sight End Barrel Easy to Fit Revolvers Pistols Rifle and Air Guns with 4 Sets of Batteries and Spare O-Rings

• [Specification] Laser class: IIIa. Max. Output Power:＜5mW.It is clear and bright providing high visibility when looking through your scope or sights for up to 100 yards. 【Precisely Fit and Accurate】The laser boresighter is suitable for .17hmr and .177 calibers, caliber specific.It is directly into the barrel (without suppressor),If your rifle has a suppressor, you will need to remove it before you use the boresighter, so easy and very accurately. [Supply of Batteries and O-Rings] 4 sets (12 total) upgraded batteries and multiple spare O-rings.Use 3 pieces LR41 batteries at a time and the red laser will last up to 1.5 hours. And come with the portable packing boxes that you can carry with you.It is a perfect gift to friends or elders. 【High Accuracy】The fastest red dot laser zeroing and sighting system.Gets you much closer to your target without wasting time and money. [Light weight ] Adapts with superior materials, sturdy brass construction. Premium O-rings hold the bore sight laser and protect the barrel from damage.