Stern Defense makes great AR magazine well adapters. With one of Stern’s adapters, you can turn your AR Lower into a Pistol Caliber Carbine that accepts Glock magazines (9mm/.40). They didn’t stop there. They also make adapters for Beretta Magazines (9mm), S&W M&P magazines (9mm/.40) and another S&W M&P model which uses .45 ACP. Mag-AD […]