The Magpul AMAG SG9 Magazine for SIG SAUER P320, M17, and M18 is expertly crafted for seamless integration and smooth operation. It features a stainless steel body with polymer subcomponents built to last. This Magpul magazine utilizes a high-visibility, controlled-tilt orange follower pushed by a stainless steel spring. These sit on a flared floorplate that's easy to remove for cleanings and maintenance. Mark your magazine with the paint-pen dot matrix. Know how close you are to empty by referring to the capacity-indicator windows, which start at 5 rounds and continue at 1-round increments. This magazine is compatible with full-size, compact, and sub-compact variants of the P320, M17, and M18 platforms. Stainless steel body with polymer subcomponents High-visibility, controlled, tilt orange follower Stainless steel spring Flared floorplate that's easy to remove for cleaning and maintenance Paint-pen dot matrix Capacity-indicator windows that start at 5 rounds and continue at 1-round increments Compatible with full-size, compact, and sub-compact variants of the P320, M17, and M18 platforms