LanTac M-Spec Bolt Carrier Group Features The Lantac Usa M-Spec is built as a full auto style carrier with increased mass manufactured from 8620 steel and case hardened before being hard turned and ground so internal dimensions remain exact to milspec. This precision machining ensures the carrier runs smoothly within a properly built AR-15 upper minimizing the friction points that can cause premature wear or malfunctions. Rather than the standard Type M phosphate coating Lantac finishes the carrier in Nickel Boron a coating that increases corrosion resistance while also improving lubricity which means less fouling buildup and smoother cycling over extended use. The bolt itself is machined from Carpenter 158 or 9310 steel shot peened and hard turned to the same demanding military specification as the carrier. Each M-Spec bolt carrier group is further fitted with Lantac s own CP-R360 domed cam pin precision machined from 17-4PH stainless steel and hand polished before being hardened to H900 condition. This domed cam pin further reduces friction within the upper receiver contributing to smoother overall cycling and reduced wear over the life of the rifle. Chambered for .308/7.62mm and built to fit the AR-15 pattern platform this M-Spec line is intended for budget conscious builds where quality and reliability still matter. The Lantac Usa M-Spec Bolt Carrier Group gives builders a dependable milspec quality foundation available for sale at GrabAGun. LanTac M-Spec Bolt Carrier Group Specifications Manufacturer: LanTac Model: M-Spec Caliber: 7.62 X 51 Compatible Hosts: AR-15 Material: Stainless Steel Finish: Nickel Boron Style: Full Auto Available At: GrabAGun