Faxon Firearms Match Series 6mm ARC Gunner Complete Upper - 12.5"

Sub-MOA capable, tunable, and suppressor-ready — the Faxon Match Series 6mm ARC Gunner Complete Upper brings long-range 6mm ARC ballistics to a compact 12.5" AR-15 pistol build, with everything above the lower assembled and an adjustable gas block ready to tune for suppressed or unsuppressed use.

The Faxon Match Series 12.5" 6mm ARC Gunner Complete Upper is a fully assembled, suppressor-optimized complete upper receiver group for AR-15 pistols and SBRs, featuring a 416-R stainless Match Series Gunner barrel, adjustable gas block, MuzzLok Plan B flash hider, and SuperFinished Type 2 ARC BCG installed.

6mm ARC delivers flat trajectories and superior retained energy at distance compared to 5.56 from a standard AR-15 lower — in a compact 12.5" suppressed package. The patented Faxon adjustable gas block lets you tune gas flow precisely for suppressed and unsuppressed use, as well as across subsonic and supersonic 6mm ARC loads. The MuzzLok Plan B flash hider provides direct HUB-mount suppressor compatibility with repeatable timing and no crush washers required.

Features:

• Caliber: 6mm ARC
• Barrel Length: 12.5"
• Barrel Profile: Gunner (Match Series)
• Barrel Steel: 416-R Stainless
• Twist Rate: 1:7.5
• Gas System: Carbine-Length
• Gas Block: Faxon Patented Adjustable .750" Low Profile
• Handguard: Faxon Streamline 10.75" M-LOK
• Muzzle Device: MuzzLok Plan B Flash Hider, 5/8x24, .375" bore, Stainless Nitride
• BCG: Faxon SuperFinished 6.5 Grendel/ARC Type 2 Nitride (included)
• Charging Handle: Faxon Edition Breek Sledgehammer gas-blocking (included)
• Extension: Nickel-Teflon coated
• Product Type: Complete Upper Assembly

Compatible with mil-spec AR-15 lowers. The Type 2 BCG provides the correct bolt face for 6mm ARC. The Plan B flash hider (5/8x24) accepts HUB/Plan B-compatible suppressors directly, including Faxon HARMONIX and CORESYNC models. The Breek Sledgehammer gas-blocking charging handle is included and recommended for suppressed use to manage gas blowback. Lower receiver, brace/stock, and magazine sold separately.

416-R stainless Match Series Gunner barrel with Nickel-Teflon extension, in-house button rifling, and MPI inspection deliver sub-MOA potential with the right ammunition and optic.

Ideal for suppressed hunting, precision SBR builds, long-range competition setups, and shooters who want 6mm ARC ballistics in the most compact and quiet AR-15 pistol configuration possible.

Faxon Firearms manufactures their Match Series barrels in-house in Cincinnati, Ohio, with rigorous quality inspection on every unit before it ships as part of a complete upper assembly.