**PROOF Research Carbon Fiber Wrapped 6mm ARC Barrels **
We’ve built our AR barrels lineup to emphasize performance, reliability, and compatibility with today’s most efficient calibers. These 6mm ARC barrels from PROOF Research are carbon fiber wrapped, giving you the performance of a heavy contour barrel without the associated weight. All barrels are rigorously inspected by us for visual defects before shipping.
NOTE: These inspections are visual only. Bore scoping and full headspace checks are not currently included, but will be offered soon as an optional add-on when purchasing a barrel and BCG together.
Available Options & Specifications:
| Part # | Barrel Length | Twist Rate | Gas Length | Gas Journal | Gas 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 |
All barrels include appropriately sized gas tubes (excluding 16” model, which we provide rifle-length tubes for).
Why Carbon Fiber Wrapped?
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Weight Savings: Delivers the strength and heat resistance of a heavy barrel with much less weight.
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Faster Cooling: Carbon fiber wraps dissipate heat quickly, improving barrel life and consistency between shots.
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Improved Rigidity: Carbon fiber provides increased stiffness over standard profiles, reducing harmonic vibration.
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Corrosion Resistance: Outer wrap protects against external wear and corrosion.
Ammo Compatibility & Testing
These barrels have been extensively tested with Ally Munitions 65gr Coyotero loads. Across all barrel lengths, function has been outstanding.
Depending on suppressor and system setup, you may need to tune accordingly. Shorter gas systems typically require less adjustment. For tuning tips, be sure to:
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Listen to the TPH Podcast
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Explore our Blog
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Reference our Buffer Weight Chart
Insider Notes from Wade
We've run these barrels in several of our test rifles and continue to be impressed. They show outstanding craftsmanship — borescoping has revealed incredibly clean rifling and precision.
These pair excellently with CMC BCGs, which we've used in our own builds. Headspacing has always been spot-on. Pairing a CMC BCG and the included CMC gas tube ensures a tight, efficient gas system with matched tolerances.
Be sure to explore our site for recommended build components — from gas blocks to buffer systems — that work seamlessly with these barrels.
We believe in offering components that we trust in our own rifles, and this is one of them.
