The Magpul AMAG®21 SG9 is a 21-round 9mm handgun magazine for the SIG P320 family of pistols featuring a heat-treated, stainless-steel alloy body with polymer sub-components. Magpul AMAGs come with many proven features, including a high-visibility, controlled-tilt follower, stainless-steel spring, flared floorplate that’s easily removable for cleaning and routine maintenance, paint-pen dot matrix for magazine marking, and capacity-indicator windows which begin at five (5) rounds, and continue along the spine of the magazine in one-round increments.

The Magpul AMAG 21 SG9 is compatible with all full-size, compact, and sub-compact variants of the SIG P320/M17/M18 platform.