MLR - Carbon Fiber PROOF RESEARCH 22" CARBON FIBER Barrel15.5" M-LOK HandguardElite Series Muzzle Brake.875 Superlative Arms Adjustable Gas BlockRifle-Length Gas SystemBillet Upper/Lower ReceiverMLR BCGMLR Charging HandleCMC 3.5lb Single-Stage Flat TriggerLancer Carbon... MSRP: Was: Now: $4,200.00 Choose Options