Government Rifle-length AR15 Barrels

Criterion’s government rifle-length AR15 barrels are mil-spec barrels that feature a lightweight profile between the chamber and gas block journal with a heavier muzzle end. Government contour barrels have been tested in the world’s most austere combat environments. They are an excellent choice if you are building your next training rifle or cloning the rifle you carried in the service.

Why the Government Contour?

• Original Government contour - lightweight design that is easily carried in the field
• .223 Wylde chamber - safely and reliably fires both .223 Remington and 5.56 NATO with improved accuracy due to more consistent chamber pressures
• Chrome-lined - improved barrel life and corrosion resistance without degrading accuracy
• Honed - refines bore for superior uniformity to reduce bullet deformation
• Hand-lapped - essential for accuracy and to minimize fouling
• Polished chamber - reliable extraction and feeding
• Precision-machined barrel extension - safe and reliable feeding

Government Specs

Why Headspace Matters

Purchasing a headspaced bolt is not required. However, Criterion's headspace service guarantees optimal bolt to barrel fitment using premeasured bolts and certified headspace gauges, helping to maximize the performance and function of your build.

Headspace (the critical measurement from the bolt face to the shoulder of the chamber), must be checked for optimal performance and reliability. Proper headspace produces consistent chamber pressures and seating depths which results in increased accuracy and reliability, while reducing wear and tear on internal parts and components.