The DuraMag SS AR-10 SR-25 magazine is designed for use in AR-10 and SR-25 pattern rifles, supporting .308 Winchester, 7.62x51mm NATO, and 6.8x51mm cartridges. The magazine features a single-piece, laser-welded 410 stainless steel body with a T-360 protective coating for durability and corrosion resistance. It uses an orange advanced-geometry follower for smooth operation. 410 stainless steel body with T-360 coating. For AR-10 and SR-25 pattern rifles in .308 Win, 7.62x51, or 6.8x51. 20-round capacity.