MAGPUL AMAG 21 SG9 – 21-Round Magazine for SIG P320

The AMAG 21 SG9 is a high-capacity 21-round magazine designed for the SIG P320/M17/M18 platform. Crafted from heat-treated stainless-steel alloy, it offers exceptional durability, while its polymer floorplate and follower ensure smooth operation. Weighing just 4.0 oz. and measuring 140mm in length, this magazine is compatible with full-size, compact, and sub-compact P320 variants, with a slight protrusion below the grip. Whether for duty, competition, or personal defense, the AMAG 21 SG9 delivers unmatched capacity and reliability.