KAK Industry Bolt Carrier Group Features The KAK Industry Bolt Carrier Group pairs a 9310 steel bolt with a chrome cam pin and a 4130 steel gas key to handle the heat and pressure cycles an AR-15 generates shot after shot. The M15 auto profile carrier is machined to the dimensions platform builders expect so it drops into a standard AR-15 upper without fitting work. Chambered for 5.56 / .300 AAC Blackout this group lets an owner run either cartridge in the same upper without sourcing a separate bolt. The chrome finish on the bolt body resists corrosion and makes carbon fouling easier to wipe away during routine maintenance. At roughly 8 inches overall this BCG is sized to standard AR-15 specifications and installs as a direct drop-in replacement or as the heart of a fresh build. KAK Industry built its name supplying American-made AR-15 components at accessible prices and this bolt carrier group reflects that same approach. It suits builders upgrading a worn factory BCG as well as anyone assembling a new upper who wants a dependable steel bolt and carrier. This KAK Industry Bolt Carrier Group is available for sale at GrabAGun for AR-15 owners who want proven materials behind their rifle s cycling components. KAK Industry Bolt Carrier Group Specifications Manufacturer: KAK Industry Model: Bolt Carrier Group Type: Bolt Carrier Group Caliber: 5.56 / .300 AAC Blackout Material: 9310 Steel Bolt Finish: Chrome Color: Silver Length: 8 Firearm Fit: AR-15 Available At: GrabAGun