Barrett Rifle Magazine, 50 BMG, 10 Rounds, Fits 82A1 Rifles, Steel, Matte Finish, Black 13355 This Barrett factory magazine features an anti-tilt follower and stress-relieved chrome silicone spring for the ultimate in reliability. Fits the M82A1 series of rifles. 10 Round capacity and Black finish. This M82A1 magazine will also work in the Barrett M107A1" but lasks the round count witness marks present on M107A1 magazines.