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Proof Research built their name on carbon fiber wrapped barrels, and this 12.5" 300 Blackout is a great example of what that technology brings to a short-barrel AR-15 build. The barrel core is 416 stainless steel wrapped in high-strength, aerospace-grade carbon fiber set in a proprietary matrix resin. The result runs up to 64% lighter than a steel barrel of the same contour, which makes a real difference on a pistol or SBR build where every ounce out front changes how the gun handles.
Weight savings get most of the attention, but the carbon fiber wrap also pulls heat away from the bore. That means the barrel stays cooler and holds its point of impact better through extended shooting, and it wears longer than a bare steel barrel pushed the same way. For a caliber like 300 Blackout that's often run suppressed and shot in strings, that heat management is worth having.
This one wears a 1:7 twist, which stabilizes the heavy subsonic 300 Blackout loads people run through cans as well as lighter supersonic ammo. It's set up with a pistol-length gas system and a .750 gas journal, and the muzzle comes threaded 5/8×24 so it's ready for your suppressor or muzzle device right out of the box. Proof's Caliber Matched Gas System (CAMGAS) tunes the port location to the cartridge and barrel length, which smooths out the recoil impulse, cuts down on receiver fouling, and eases wear on your brass.
These arrive threaded, chambered, and ready to drop into a standard AR-15 upper, so if you've built an AR before this is a straightforward swap. The 300 Blackout cartridge was designed to perform out of short barrels, so pairing it with a 12.5" carbon fiber tube gives you a light, compact, suppressor-friendly setup that's easy to move with. Proof recommends running a full-mass bolt carrier group for reliable cycling.
Yes. It arrives threaded, chambered, and ready to drop into a standard AR-15 upper receiver. You'll supply the rest of your build components, and Proof recommends a full-mass bolt carrier group for consistent cycling.
This barrel comes with a 1:7 twist. That rate handles the heavy subsonic 300 Blackout loads folks like to run suppressed, and it also stabilizes lighter supersonic ammo well, making it a flexible choice.
It's built with a pistol-length gas system and a .750 gas journal diameter. The muzzle is threaded 5/8×24, which is the standard for 300 Blackout, so it works with common suppressors and muzzle devices.
Proof Research reports these carbon fiber wrapped barrels run up to 64% lighter than a steel barrel of the same contour. On a short pistol or SBR build, that weight reduction up front noticeably improves how the gun balances and points.
| UPC | 843068100523 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 100523 |
| Length | 12.5'' |
| Model |
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