Cmmg Ar-15 Carbine Spring Action
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Cmmg Ar-15 Carbine Spring Action, When combined with a carbine-style buffer, this carbine-style spring is perfect for installation into a traditional, carbine-length receiver extension for your AR-15 build. The weight and resistance of this spring-and-buffer combination provides the balance needed to ensure reliable operation with any carbine-length gas system. Mfg: Cmmg