CMMG 55CA6C7 Receiver Extension Kit includes Carbine Style Buffer & Action Spring for for AR-15

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This CMMG Receiver Extension kit comes with a carbine buffer assembly and a carbine action spring.

Combine this kit with your choice of lower parts kit & butt stock to complete your lower group

Includes:
-CMMG 6-position receiver extension
-Carbine buffer assembly
-Carbine action spring