This Stern Defense AR-15 Conversion Adapter is a magazine-well adapter block from STERN DEFENSE (brand part no. 001SDMAGADMP45A) that lets an AR-15 pistol-caliber-carbine build accept Smith & Wesson .45 ACP-pattern magazines instead of Glock- or Colt-pattern magazines. It installs in place of a standard magazine well insert on a properly configured 9mm/.45-caliber AR upper and lower combination.

Key Specifications

• It is a magazine-well adapter that lets an AR-15 pistol-caliber build accept a different magazine pattern.
• It swaps in for the lower’s stock magazine-well insert without machining the lower itself.
• It is machined specifically for Smith & Wesson .45 ACP-pattern magazines.
• It requires a properly configured pistol-caliber AR upper/lower combination to use.

Frequently Asked Questions

Does this work with a standard 5.56 AR-15? No, this adapter is for pistol-caliber AR builds already configured to run .45 ACP; it does not convert a standard 5.56/.223 rifle.

Which magazines does this accept? It is machined for Smith & Wesson .45 ACP-pattern magazines (such as M&P45-pattern mags), not Glock- or Colt-pattern .45 ACP magazines.

Buy the Stern Defense AR-15 Conversion Adapter for S&W .45 ACP Magazines

Pick up the Stern Defense AR-15 Conversion Adapter for S&W .45 ACP Magazines from our Rifle Parts selection at Schaefer Defense, shipped fast and fully insured from our Lubbock, TX gun shop.