Barrett Rifle Magazine, 50 BMG, 10 Rounds, Fits M107A1 Rifles, Steel, Matte Finish, Black 12808 This Barrett factory magazine features an anti-tilt follower and stress-relieved chrome silicone spring for the ultimate in reliability. Fits the M107A1 series of rifles. 10 Round capacity and Black finish. This M107A1 magazine will also work in the Barrett M82A1. It has round count witness marks" which the M82A1 magazines lack" but otherwise will function identically.