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Faxon Firearms Match Series Gunner Profile Barrel — .338 ARC, 12.5", Pistol-Length Gas, AR-15 Fit, Nitride, Black (15B338A8P125NGQ-5R-NP3) — Informational Overview
The Faxon Firearms Match Series Gunner Profile Barrel in .338 ARC is an AR-15–pattern barrel configured with a 12.5-inch length and a pistol-length gas system. This barrel is listed with a nitride finish in black and is identified by part number 15B338A8P125NGQ-5R-NP3 (also shown in some listings as 15B338A8P125NGQ5RNP3) and UPC 816341028845. It is categorized under Faxon’s “Match Series,” indicating a product line typically associated with tighter manufacturing controls and performance-focused barrel specifications (exact tolerances and features depend on the specific SKU).
Because newer chamberings and short-barrel gas system setups can be sensitive to configuration details, users typically confirm the complete spec sheet—such as chamber type, twist rate, gas port sizing, and recommended buffer/spring ranges—from the manufacturer for this exact part number.
Key Identifiers
Manufacturer: Faxon Firearms
Series: Match Series
Profile: Gunner
Caliber/Chambering: .338 ARC
Barrel Length: 12.5 inches
Gas System Length: Pistol length
Platform Fit: AR-15
Finish: Nitride, Black
Part Number / MPN: 15B338A8P125NGQ-5R-NP3 (also listed as 15B338A8P125NGQ5RNP3)
UPC: 816341028845
.338 ARC Chambering: Configuration and Compatibility Considerations
This barrel is chambered in .338 ARC, a modern AR-platform cartridge. With newer chamberings, build compatibility often depends on the complete system (bolt, magazine, gas tuning, buffer system, and ammunition). Users typically confirm:
Correct bolt compatibility for the chambering
Magazine compatibility and feed geometry considerations
Gas system tuning requirements for the chosen load and configuration
Ammunition availability and performance expectations for intended use
Because “AR-15 fit” primarily refers to the barrel’s interface with AR-15 upper receivers, other components still need to match the chambering’s requirements.
12.5" Length with Pistol-Length Gas: System Behavior Notes
A 12.5-inch barrel with a pistol-length gas system is commonly selected for compact AR builds where reliable cycling is expected with a shorter dwell time. In practice, short-barrel configurations can be more sensitive to:
Gas port sizing and ammunition pressure curves
Buffer weight and spring selection
Suppressed vs unsuppressed use (where applicable)
Muzzle device and backpressure effects
For best results and safe operation, users typically follow manufacturer guidance and confirm function through appropriate testing once assembled.
Faxon “Gunner Profile”: Weight Distribution and Handling
Faxon’s Gunner profile is generally associated with a barrel contour intended to balance weight reduction with maintaining stiffness where it matters most (exact contour details vary by model). In general terms, profiles designed around “balanced handling” aim to:
Reduce forward weight compared with heavier contours
Maintain practical rigidity for consistent use
Provide a handling feel that isn’t excessively front-heavy
The actual feel depends on the handguard length, muzzle device, and the rest of the build.
Nitride Finish (Black): Corrosion Resistance and Maintenance
A nitride finish (often associated with processes like salt bath nitrocarburizing) is commonly used on barrels to improve:
Surface hardness and wear resistance
Corrosion resistance compared with untreated steels
Ease of cleaning relative to bare steel surfaces
While nitride can enhance durability, routine maintenance practices still apply, especially after high round counts or exposure to moisture and fouling.
Part Number Notes: Matching the Correct SKU
This barrel is referenced as 15B338A8P125NGQ-5R-NP3 and also appears in some catalogs without punctuation as 15B338A8P125NGQ5RNP3. When verifying the exact product, the most reliable identifiers are:
UPC 816341028845
The full configuration string: .338 ARC, 12.5", pistol-length gas, Gunner profile, nitride finish
Installation, Safety, and Legal Considerations
Barrels are safety-critical components. Proper installation typically involves:
Correct torque and assembly procedures
Headspace verification as applicable to the build
Function checks and safe test firing procedures
Following all local and federal laws regarding firearm configuration, barrel length, and lawful build types
If unsure about compatibility, tuning, or assembly, many builders consult a qualified armorer or gunsmith.
Quick Reference Summary
Faxon Firearms Match Series Gunner Barrel
.338 ARC, 12.5", pistol-length gas
AR-15 fit
Black nitride finish
MPN: 15B338A8P125NGQ-5R-NP3 / 15B338A8P125NGQ5RNP3
UPC: 816341028845
The End
