The CMMG A1 Receiver Extension and Stock kit contains a rifle buffer assembly, rifle action spring and an A1 rifle length butt stock assembly. Combine this kit with your choice of lower parts kit to complete your lower group.
CMMG 55CA646 Receiver Extension Kit A1 Fixed Black Synthetic for
CMMG 55CA646 Receiver Extension Kit A1 Fixed Black Synthetic for AR-Platform
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