PROOF Research Carbon Fiber Wrapped 6mm ARC Barrels
Now Inspected In-House – Better Comes Standard
At Ally Munitions, we don’t just resell barrels—we verify them. Every PROOF Research 6mm ARC barrel we carry now goes through our comprehensive barrel inspection process. From visual checks to critical dimension validation, we ensure you’re getting a component that’s worthy of your build.
These carbon fiber wrapped barrels combine the thermal performance of a heavy contour with the lightweight handling modern AR platforms demand. Built by PROOF, verified by us—better comes standard.
Available Options & Specifications
| Part # | Length | Twist | Gas Length | Journal | Port Size | Muzzle Thread | Weight |
|---|---|---|---|---|---|---|---|
| 130421 | 14.5" | 1:7.5 | Intermediate | .750 | .082 | 5/8-24 | 1 lb 9 oz |
| 128657 | 16" | 1:7.5 | Rifle | .750 | .096 | 5/8-24 | 1 lb 12 oz |
| 128671 | 18" | 1:7.5 | Rifle +1 | .750 | .096 | 5/8-24 | 1 lb 14 oz |
| 130438 | 20" | 1:7.5 | Rifle +1 | .750 | .093 | 5/8-24 | 2 lb 1 oz |
Note: All barrels include matched gas tubes (excluding the 16", which comes with a standard rifle-length tube).
Why Carbon Fiber Wrapped?
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Weight Reduction – Heavy-barrel accuracy without the bulk
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Increased Rigidity – Reduces vibration, tightens shot groups
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Corrosion Resistance – Wrapped surface adds durability and weather resistance
Ammo Compatibility & Real-World Testing
Every barrel has been vetted with Ally Munitions 65gr Coyotero loads across all lengths. Performance has been outstanding in both suppressed and unsuppressed setups.
Tuning Notes:
Shorter gas systems tend to be more forgiving. For optimal performance in your setup, check out:
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The TPH Podcast
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Our Blog
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Buffer Weight Chart
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Insider Notes from Wade
What We’ve Seen
We’ve run these barrels extensively in-house and continue to be impressed. Borescoping reveals exceptionally clean rifling and consistent bore quality. Headspacing has been spot-on with both CMC BCGs and the Superlative Arms BCGs we carry—ensuring reliable function with minimal fuss.
When paired with the included gas tubes and a quality carrier, these barrels create a tightly tuned gas system that runs clean and consistent.
Want to replicate our builds? Browse our full line of curated components—from gas blocks to recoil systems.
We only sell what we use in our own rifles—and these barrels are a standout.
