Features: BRIGHTNESS: Features a 5mW peak, 630-670nm, Class 3A visible red laser that is in conformance with and complies with 21 CFR 1040.10 with a max power output of "5mW" for a "Class 3R Red Laser" - the brightest beam allowed by law EASE OF USE: Laser automatically turns on when closed into chamber - Align scope, iron sights, or laser sight with the beam coming from the bore sight CONVENIENT: Use the .223/5.56 base laser cartridge or insert into adapter cartridges to change caliber COMPATIBLE: Works with all LaserLyte laser trainer targets FITS: .223, 5.56 x 45mm NATO, .25-06, .270, .30-06, .243, .308, 7mm-08, .260