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Pistol-caliber carbine enthusiasts are increasingly turning to 9mm, but some prefer a more powerful pistol caliber for their carbine. The .45 ACP AR-15 M&P Conversion Adapter from Stern Defense satisfies this demand. Designed to be used with M&P pistol magazines that accept .45 ACP rounds, this adapter is compatible with any mil-spec AR-15 lower and can be easily installed in a matter of seconds. It even includes a last-round bolt hold-open feature. Each adapter is crafted from 6061-T6 aluminum and includes a 4140 NiB-coated feedramp for durability. The adapter also includes an ergonomic, easy-to-use magazine release and is compatible with all generations of Smith & Wesson M&P pistol magazines that accept the .45 ACP cartridge.