Iron Horse 6mm ARC & Proof Research Complete Upper
• PROOF RESEARCH CARBON FIBER BARREL 18" 1-7.5T
- Chambered in 6mm ARC
• PICATINNY RAIL
• QD MOUNTS
• M-LOK 3, 6, & 9 O'CLOCK
• SEEKINS ADJUSTABLE GAS
• DEAD AIR KEYMO MUZZLE BRAKE
• [BCG, CHG'G HANDLE NOT
INC.]