Magpul's AMAG 21 is a purpose-built polymer magazine for the SIG P320 in 9mm, applying the same engineering that made PMAGs the standard in the rifle world to a striker-fired pistol. Magpul's approach uses a stiff polymer body that resists the feed-lip spread and denting that plagues thin steel magazines, paired with a constant-curve geometry and anti-tilt follower to keep rounds presenting cleanly. For a duty or competition P320, having several identical spares that you can drop on concrete without worry is the practical argument for polymer.

In stock and ready to ship straight to your door from Dawson Defense, an Arizona-owned licensed dealer.