Stern Defense AR-15 Mag Well Adapter for M&P 9mm/40S&W, Black- MAG-ADMP9&40

Convert your standard mil spec AR 15, M4, M16 lower assembly to use 9mm and .40 S&W M&P and P320/P250 Magazines! The Mag-AD series adapters install in seconds. Boasting a last round hold open feature making them a breakthrough product and a must-have for law enforcement and civilian gun enthusiasts alike. The Stern Mag-AD series adapters are made of aircraft grade aluminum, lightweight with ergonomic design.Note: These adapters require the use of a 9mm or 40S&W barrel, "depending on chosen caliber" and a Glock cut bolt.Features: 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 magazinesWorks with any mil spec AR-15 lower receiver.All gun components besides the Bolt and Barrel remain stock