The Faxon 10.5″ 300 Blackout Gunner Barrel with Pinned Gas Block removes the hardest part of short-barrel builds: correctly pinning the gas block. We pre-notch the journal, drill the block, and include the pin—so your gas system won’t shift or loosen under fire.

Built from 4150 CMV steel with a nitride finish, this Gunner profile blends Gov’t durability with Pencil-like weight savings for superb handling. Pistol-length gas optimizes function with both supers and subs (especially suppressed), while 1:8 twist stabilizes a wide range of 300 BLK projectiles.

Key Benefits

• Factory-pinned .750″ gas block: Pre-drilled and aligned for maximum security and easy installation.
• Gunner profile balance: Gov’t strength with Pencil weight for faster transitions and reduced fatigue.
• Pistol-length gas: Reliable cycling with subsonic and supersonic 300 BLK, ideal for suppressed builds.
• Duty-ready construction: 4150 CMV, button-rifled 1:8, and QPQ nitride inside & out.
• Precision QC: Stress relieved, air-gauge tested, MPI-inspected, and headspace verified in-house.

Specifications

• Barrel Material: 4150 CMV
• Barrel Type: Button Rifled 
• Barrel Caliber: 300 BLK
• Barrel Twist: 1:8
• Barrel Length: 10.5”
• Barrel Profile:  GUNNER
• Barrel Gas System: Pistol
• Inside Finish: Nitride
• Outside Finish: Nitride
• Muzzle Thread: 5/8×24 
• Gas Block Diameter: .750″ 
• Gas Block Journal Length: 1.9″
• Barrel Extension: M4 
• Weight:  1.10 lbs
• Magnetic Particle Inspected
• 11-degree Target Crown