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The NcSTAR TLZ12G Red Laser Bore Sighter fits 12 Gauge Shotgun Chambers. It is perfect for slug hunters and it's one of the more hard-to-find sizes for a cartridge laser bore sighter. The NcSTAR 12 Gauge Bore Sighter is self-contained and ready to use, with no other accessories needed. Save ammo when sighting in - get yourself on paper without firing a shot, with the NcSTAR 12-Gauge Laser Bore Sighter.