Faxon Firearms Bolt Carrier Group Features The Faxon Firearms Bolt Carrier Group treats mil-spec as a starting point rather than a finish line refining materials inspection and surface treatment for smoother cycling and longer service life. At its core is a Type II .136 inch bolt machined from 9310 tool steel a material prized for its strength and fatigue resistance under the repeated stress of firing. Every bolt undergoes magnetic particle inspection to confirm the material is sound and free of defects backed by full mil-spec heat treatment and shot peening. The back of the bolt lugs is chamfered to support reliable cycling even under demanding conditions or with higher pressure handloads. Salt bath nitride treatment covers both the bolt and carrier increasing surface hardness reducing resistance during cycling and delivering superior corrosion resistance compared to typical chrome or phosphate finishes. Faxon s superfinishing process further smooths the carrier body reducing friction and fouling for easier maintenance and more consistent operation. An S7 extractor along with a properly installed spring insert and Crane O-ring round out a reliable extraction system while grade 8 gas key fasteners are fully staked for long-term durability. Built on the M16 pattern and full auto compatible this bolt carrier group is designed for 6.5 Grendel and is also compatible with 6mm ARC and 22 ARC builds. Faxon Firearms Bolt Carrier Group Specifications Manufacturer: Faxon Firearms Model: Bolt Carrier Group Series: Type 2 Caliber: 6.5 Grendel / 6mm ARC / 22 ARC Material: 9310 Tool Steel Finish: Salt Bath Nitride Color: Black Compatible Hosts: AR-15 Bolt Type: Type II (.136) Inspection: Magnetic Particle Inspection (MPI) Extractor: S7 Full Auto Rated: Yes Available At: GrabAGun