Description
H&K HK MR556/416 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.
Compatible With:
- HK MR556
- HK 416
