Lower Receiver Group w/ MK2 Receiver Extension & Stock Mod

BCM Lower Group w/MK2RMS-M1T0 & BCMGUNFIGHTER Stock Mod-1-SOPMOD (Compartment) – Black – Utilizes the BCM MK2 Receiver Extension, MK2 buffer, and rifle M16 action spring. The MK2 receiver extension is approximately 3/4” longer than the standard 6-position extension.