KAK Industry Bolt Carrier Group Features The KAK Industry Bolt Carrier Group is machined from steel and finished with an NP3 coating a nickel-Teflon treatment that lowers friction between the bolt and carrier and resists the buildup of carbon fouling. That reduced friction means smoother cycling and easier cleaning after a long session at the range since fouling wipes away rather than baking onto bare metal. Chambered specifically for 7.62x39mm the carrier group is built to handle the pressures and dimensions of that cartridge in an AR-pattern host. A properly matched bolt carrier group is one of the most important parts of a reliable AR build and this unit is sized and weighted for dependable function. At 11.5 ounces the group s weight is in line with standard AR bolt carrier groups which helps it work correctly with common buffer springs and buffer weights without additional tuning. The NP3 finish also adds a layer of corrosion resistance beyond what a bare steel surface offers extending the service life of the part in humid or harsh environments. Builders assembling a 7.62x39mm upper from scratch or owners replacing a worn factory carrier get a straightforward drop-in upgrade with this group. A dependable well-finished bolt carrier group like this one is a practical investment for anyone running the 7.62x39mm chambering in an AR platform. KAK Industry Bolt Carrier Group Specifications Manufacturer: KAK Industry Type: Bolt Carrier Group Caliber: 7.62x39mm Material: Steel Finish: NP3 Coated Weight: 11.5 oz Available At: GrabAGun