Maximize your firepower with the Magpul AMAG 21 SG9 magazine for the SIG P320/M17 platform—built for shooters who demand high capacity without sacrificing reliability or durability. Engineered to Magpul’s proven standards, this 21-round 9mm magazine delivers consistent performance whether you're on duty, at the range, or running hard training drills.

Constructed with a corrosion-resistant stainless-steel body, the AMAG 21 SG9 is designed for long service life in harsh environments. Inside, a high-visibility, anti-tilt follower ensures smooth, reliable feeding while allowing quick visual confirmation of status. The stainless-steel spring is optimized for longevity, maintaining consistent tension even after extended use.

The flared, easily removable floorplate enhances reload speed and simplifies maintenance, making cleaning and servicing fast and efficient. Capacity indicators in single-round intervals starting at five rounds give you instant round-count awareness, while the paint-pen dot matrix on the base allows for quick identification and load marking.

Compatible with all SIG P320 variants—including full-size, compact, and sub-compact frames—the AMAG 21 SG9 offers increased capacity with slight extension below the grip, giving you the edge when capacity matters most.

Proudly made in the USA.