Short-barrel military carbine upper receiver groups — Mk18 CQBR, M4A1 SOPMOD Block I and Block II, URG-I, and other clone-correct CQB/SBR uppers. Charlie's Custom Clones builds and sources from Colt, Daniel Defense, Geissele, KAC, LMT, and licensed second-source manufacturers. Pick your platform below to browse uppers:
New to the Mk18 platform or need help with clone-correct configuration? Read the CCC Mk18 CQBR Reference Guide — Mod 0 vs Mod 1 vs Mod 3, the canonical configurations, and what to look for in a clone-correct build.