There’s no need to go with a pistol-caliber specific AR lower on your next pistol-caliber carbine build. With the Stern Defense AR-15 9mm Conversion Adapter you have the ability to utilize popular pistol magazines which you may already have a supply of. Stern Defense make two differ models of their Conversion Adapter, one which uses Glock magazines, and one which uses either Smith & Wesson M&P or Sig 320/250 magazines. The Stern Defense AR-15 9mm Conversion Adapter is easily installed into any mil-spec AR-15 lower receiver within seconds and even incorporates a last-round bolt hold open feature. Each adapter is machined from aluminum and requires the use of a 9m Mfg: Stern Defense, Llc
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