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.
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SB Tactical SBT01SB SBT Side Folding Black Synthetic with 10.50″ OAL & Nylon Strap for H&K UMP, B&T APC (Tube Not Included)
$59.99
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