BRT 13.9" OPTIMUM Upper Receiver Group
Barrel: BRT OPTIMUM 13.9" HF CL or BRT OPTIMUM 14.5" SR CL
Gas System: Mid Length, optimized for 13.9"
Hand Guard: 12.6", 13" MLOK rail.
Upper: Forged from 7075 USGI M4 Upper w/ dry film lube.
Upper is test fired before shipping.
NFA Rules Apply
100% made is USA.
