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Faxon Firearms aimed to create a bolt carrier group that lives up to the name GUNNER, without sacrificing strength and function. They established specific specifications, which include:

- Lightest Weight Possible (8.5 ounces complete)
- 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

In line with their barrels, Faxon Firearms made use of the QPQ method of Salt Bath Nitride for all the components of the carriers. This process enhances the natural slickness of the carrier, requiring less gas and pressure to operate. The QPQ SBN process also improves wear resistance and seals the components from corrosion.

Improvements to the bolt carrier group include:
- Using 9310 tool steel for the bolt, which is stronger and nitrided to increase surface hardness, decrease resistance and offer superior corrosion resistance when compared with typical chrome and phosphated bolt carrier groups.
- Full Magnetic Particle Inspection (MPI) testing of all bolts to ensure the material is sound and without deficiencies.
- Bolt lugs chamfered at 45 degrees to ensure reliable operation even under high pressure hand loads and fast lightweight actions.

The Faxon Bolt Carrier Groups superfinished to reduce friction, increase smoothness of operation, reduce fouling and are full-Auto rated and maintain the trip for full-auto fire control groups and new multi-stage trigger systems. The gas keys use grade 8 fasteners and are fully staked for optimal service.

To ensure that the quality inspections are successful, the carriers all pass stringent quality checks and are laser-engraved with the Faxon Shield.

Full specifications:
Bolt:
- 9310 Tool Steel Construction (Stronger than C158)
- Full MIL-SPEC Heat Treatment
- Shot Peened to MIL-SPEC
- Magnetic Particle Inspection (MPI)
- Back of Lugs Chamfered for Reliability
- Spring, Insert, & "Crane, O-Ring Installed
- QPQ - Salt Bath Nitrided

Extractor:
- S7 Tool Steel Construction
- Fully Heat Treated
- Shot Peened Per MIL-SPEC
- QPQ - Salt Bath Nitrided

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

Cam Pin:
- 4140 Pre-Hardened Steel Material
- QPQ - Salt Bath Nitrided