After doing the unboxing, the Middle Aged Gamer puts together the BPW US SOCOM MCX SURG Kit Build. This is designed to fit a standard VFC M4 lower and your standard APFG MCX with the original MCX bolt. The kit includes an upper receiver, gas block, 300mm inner barrel, outer barrel (14mm CCW), hop-up, bolt carrier group, charging handle, SURG SLX suppressor, SURG stock adapter, and MCX telescoping/folding stock FDE. To use the kit with an APFG MCX, you may need to replace the recoil rod base part 04-06 on the SURG bolt.