Tipfun 9mm /.375 Cal / .41 Cal / 40sw/10mm 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

• 【Parameters】Class IIIA laser, less than 5mW.Clear and bright red laser, which can provide longer distance. [Caliber Specific] The laser boresighter is suitable for 9mm /.375 cal / .41 cal / 40sw/10mm.It is directly into the barrel (without silencer), so it is easy to use and very accurately. 【High Accuracy】The fastest red dot laser zeroing and sighting system and save you time and cartridges.Save both time and money by avoiding prolonged live fire tests at the range. 【High Quality Material】Sturdy brass construction.Using high quality laser module with qualified electronic components to support longer and consistent lifetime. 【Spare parts】 4 sets (12 total) upgraded batteries and multiple spare O-rings. Never worry about the working time anymore.And come with the portable packing boxes that you can carry with you.