Lantac Enhanced Bolt Carrier Group, .223/5.56mm Nickel Boron, Side Charger. This high-quality enhanced bolt carrier group is made from 8620 steel and coated with nickel boron. It ships with three side charger options: knurled steel, smooth steel with a silicone insert, and steel core with a neoprene sleeve. All charging handle threads are 1/4-28 UNEF. RSR -
