Note - Product is for the STRIPPED bolt carrier with gas key installed. For the complete GUNNER BCG including bolt, click here. When looking at lightweight bolt carrier groups, we were unsatisfied with what the market had to offer. Seeing a capability gap, we set out to create a bolt carrier group that could live up to the GUNNER name with no compromise in strength or function. We set specifications that would allow no compromise: Lightest Weight Possible (6.24 Ounces Carrier & Key Only) MIL-SPEC Materials & Finishes or Better! Forward Assist Serrations Compatible with Dust Covers Maintains Full-Auto Trip Sear for full-auto and the new multi-stage trigger functionality Looks Amazing Matching our barrels, we selected the QPQ method of Salt Bath Nitride for all the carriers components. By coating all parts, the carrier's natural slickness is increased markedly requiring less gas and pressure to operate. Further, the QPQ SBN process seals components against corrosion while making them fantastically wear resistant. Faxon Bolt Carrier Groups are Superfinished to reduce friction, increase smoothness of operation, and reduce fouling. Further, they are full-Auto rated and maintain the trip for full-auto fire control groups and new multi-stage trigger systems. Gas keys use grade 8 fasteners and are fully staked for a lifetime of service. As a testament of our confidence, the carriers are all laser-engraved with the Faxon Shield after passing all Quality inspections. Detailed Specifications: Carrier & Key: Superfinished Carrier Carrier: MIL-SPEC 8620 Steel Material Key: 4140 Steel Material Fully Heat Treated Forward Assist Serrations M16 (FULL-AUTO) Compatible Grade 8 Fasteners Fully & Properly Staked Key, Permatex Sealed QPQ - Salt Bath Nitrided Weight w/ Key (Not Bolt or any Pins): 6.32 Ounces