Bolt Carrier Groups
Since the Bolt Carrier Group (BCG) is such an integral piece of your AR15 build, don't settle for anything less than the best.
Personal Defense Weapon (PDW)
Pistol Caliber Carbine (PCC)
Designated Marksman Rifle (DMR)
Short Barreled Rifle (SBR)
Since the Bolt Carrier Group (BCG) is such an integral piece of your AR15 build, don't settle for anything less than the best.