Criterion 8.5" .300 Blackout CORE Barrel

The Criterion 8.5" .300 Blackout CORE barrel represents the pinnacle of compact .300BLK barrel design, combining Criterion's renowned accuracy with the durability needed for high round counts and suppressed shooting. The CORE Series' continuous taper profile eliminates the traditional weight distribution issues found in government or pencil profiles, resulting in more consistent harmonics and superior heat dissipation during rapid fire.

Manufactured from 4150 Chrome Moly Vanadium steel with a hand-lapped chrome-lined bore, this barrel delivers exceptional durability without sacrificing the precision Criterion is known for. The chrome lining provides extended service life and excellent corrosion resistance, particularly important for suppressed shooting where increased gas blowback can accelerate bore erosion. The 8.5" length is optimized for .300 Blackout, as the cartridge achieves near-complete powder burn in this barrel length, maximizing velocity with minimal flash signature when suppressed.

The 1:7 twist rate is specifically chosen to stabilize the full spectrum of .300 Blackout projectiles, from lightweight 110gr supersonic hunting loads to heavy 220gr subsonic match ammunition. The pistol-length gas system is properly tuned for this barrel length, ensuring reliable function with both supersonic and subsonic loads. Users consistently report sub-MOA accuracy with quality ammunition, with groups often running 0.8-0.9 MOA using 125gr or 208gr match loads. This barrel represents the ideal choice for serious .300BLK builds where accuracy and longevity are paramount.