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Customer Reviews
Most Recent Reviews
Proof 6MM Arc by Cat, Verified Owner, February 21, 2026
I have not shot this barrel yet, but it fits nicely in my upper and everything is machined well and is properly deburred. The riffling looks great when looking at it with a bore scope. I have high hopes for this barrel. If you are looking for a light...
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Color:
Stainless Steel
Caliber:
6mm ARC
Barrel Length:
22 in
Gas System Length:
Rifle +1 Length
Gas Block Journal Size-Diameter:
.750 in
Firearms Threads Per Inch:
5/8x24
Barrel Twist Rate:
1-7.5
Barrel Material:
Steel
Flutes:
No
Gun Make:
AR Platform
Gun Model:
AR-15
Weight:
2.15 lb
Gas Block Journal Size-Length:
1 in

Code: 2SB-RTB-PR08RB-143674

MPN: 143674

UPC: 843068143674

List: $749.00Save 13%
$649.00

Product Info for Proof Research AR Steel 6mm ARC Threaded Rifle Barrel

PROOF Research has designed the AR barrels with the goal of improving performance and reliability in the AR platform. The Caliber Matched Gas System (CAMGAS) results in a gas system that is tuned specifically for the cartridge and length of the barrel. The AR-15 Platform was originally designed around the 223REM and 5.56NATO cartridges and the AR-10 was designed around the 308 Win/7.62NATO round. With higher performance cartridge such as the 6.5 Creedmoor, the bore pressure remains higher further down the barrel.image

By moving the port location, Proof Research ensures that the gas system pressure is the same as what the AR platforms were originally designed around. The result is a recoil impulse that is noticeably softer, less fouling in the receiver, increased reliability of extraction, and less wear and tear on brass. This helps keep you on target and shooting while taking advantage of the latest high performance cartridges.

Specifications for Proof Research AR Steel 6mm ARC Threaded Rifle Barrel:

Manufacturer: Proof Research
Color: Stainless Steel
Caliber: 6mm ARC
Barrel Length: 22 in
Gas System Length: Rifle +1 Length
Gas Block Journal Size-Diameter: .750 in
Firearms Threads Per Inch: 5/8x24
Barrel Twist Rate: 1-7.5
Barrel Material: Steel
Flutes: No
Gun Make: AR Platform
Gun Model: AR-15
Gun Type: Rifle
Weight: 2.15 lb
Gas Block Journal Size-Length: 1 in
Application: Shooting

Features of Proof Research AR Steel 6mm ARC Threaded Rifle Barrel

  • Lightweight - Up to 64% lighter than traditional steel barrels of similar contour
  • Extreme Temperature Resistance - Improved heat dissipation for cooler and longer lasting barrels
  • Unprecedented Durability - Wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin
  • Long-Lasting - Excellent erosion wear characteristics and corrosion resistance
  • Extreme Pressure Resistance - An optimum combination of high tensile strength along with requisite toughness to withstand extreme chamber pressures encountered during firing

Package Contents:

  • Proof Research AR Steel 6mm ARC Threaded Rifle Barrel

Proof Research AR Steel 6mm ARC Threaded Rifle Barrel Orderable Models

List of Orderable Models

  • Proof Research AR Steel 6mm ARC Threaded Rifle Barrel, 22 inch, Rifle +1 Length, 1-7.5 Twist, 5/8-24, Stainless Steel, 143674 , MPN: 143674 , UPC: 843068143674 , Code: 2SB-RTB-PR08RB-143674
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