If you are a fan of pistol caliber carbines and the Sig P320, this should be good news…
Stern Defense’s updated MAG-ADMP9&40 now accepts Sig P320 magazines in addition to S&W M&P magazines. This mag adapter installs in any standard AR-15 lower in seconds for use with a pistol caliber upper (9mm or .40 S&W). The MAG-AD provides last round hold open and an easy to reach magazine release button.
![](https://jerkingthetrigger.com/wp-content/uploads/2019/01/stern-defense-mag-ad-MP-P320.jpg)