Aero Precision APUG600218M103-1: The PRO Upper Receiver Group built around Aero Precision\'s PRO 5.56 Cold Hammer Forged Barrel that is paired with their PRO 5.56 BCG. Included Enhaced M-LOK Handguard, BREACH Charging Handle, and VG6 Delta muzzle device round this assembly out into a premium turnkey solution for your next build. INCLUDES: 16.3\" PRO 5.56 Cold Hammer Forged Barrel PRO 5.56 Bolt Carrier Group M4E1 Enhanced Upper Receiver in Anodized Black 15\" Enhanced Handguard in Anodized Black VG6 Delta Flash Hider Mid-Length Gas System AR15 BREACH