Stern Defense AD9 Magazine Adapter for M&P/SIG P320

Upgrade your AR-15 with the Stern Defense AD9 Magazine Adapter. Compatible with 9mm and 40 S&W M&P, SIG P320, and P250 magazines, this adapter is crafted from 6061 T6 aircraft-grade aluminum for durability. Featuring a 4140 NiB coated feed ramp and hard coat anodized type 3 finish, it ensures reliable performance. Designed to work seamlessly with all generations of M&P magazines and any mil-spec AR-15 lower receiver, this ergonomic adapter requires a 5.4 oz buffer or heavier when using a carbine spring. Proudly made in the USA.