STERN DEF. MAGAZINE ADAPTER AD9 S&W M&P/SIG P320 9/40 MAGSSTERN DEF. MAGAZINE ADAPTERAD9 S&W M&P SIG P320 9 40 MAGSFEATURES: Made in the U. S. A. Constructed from 6061 T6 aircraft grade aluminum 4140 NiB coated feed ramp Hard coat anodized type 3 Sturdy Construction Ergonomic mag release Works with all generations of M&P magazines Works with P320 and P250 magazines Works with any mil spec ar15 lower receiver All gun components besides the Bolt and Barrel remain stock