Verschluss Heckler & Koch MR223 .223

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H&K HK MR556/416 Bolt Carrier

German HK MR556 & HK 416 Factory Bolt Carrier With The Newer Style Bolt Retaining Key

This is the factory one-piece carrier that has the out-of-battery disconnect and the bolt retaining latch assemblies installed to make up the HK MR556 (556 Nato) carrier. Just add your bolt, firing pin, and firing pin spring to make a complete bolt assembly.