The AMAG 17 SG9 is a 17-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 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.