With the Stern Defense Mag-ADMP940 adapter, you can easily convert your AR-15 into an AR-9 or AR-40. Unlike other magazine well adapters, the Mag-ADMP940 is made from lightweight 6061 T6 aircraft grade aluminum which means it’s built for longevity and reliability. With premium features like last round bolt hold open (LRBHO) and an easy to reach mag release, the Stern Defense Mag-ADMP940 is the only choice for an AR-9/AR-40 conversion!

Installs quickly, easily, and most importantly, securely into any mil spec AR-15 lower receiver.
Designed from the ground up to work with AR-15 and M16 mil-spec upper receivers.
Made in the U.S.A.
4140 NiB coated feed ramp.
Hard coat anodized type 3.
Sturdy Construction.
Works with all generations of Smith & Wesson M&P 9mm & 40 Cal. magazines*

Requires 9mm or .40 S&W. barrel and Glock cut bolt*