MÔS-Tek AR-15 Barrel: 9-inch 300 BLK



We needed a 9-inch 300 BLK AR-15 barrel for some suppressor testing, but instead of getting just one we decided to commission a very small run from custom barrel maker MÔS-Tek. These are amazingly high-quality, match-grade AR barrels.


  • 300 AAC Blackout
  • 9-inch length
  • 5/8×24 muzzle threads with recessed crown
  • Pistol length gas system
  • 0.750″ gas block journal
  • 1:7 twist, 5R rifling
  • 416 R stainless steel with bead blast finish
  • nitrided stainless steel barrel extension
  • Weighs 1.03 lbs

In its original development of the 300 AAC Blackout cartridge, AAC targeted a 9-inch barrel length for the best balance of ballistics, accuracy, weight, and compact size. Both the 9-inch barrel length and 1:7 twist rate are ideal for shooting any factory ammo and maximizing the ballistic capabilities of both subsonic and supersonic projectiles while keeping weight and length down.

All NFA restrictions apply.

In stock

Additional information

Weight 16.1 oz
Dimensions 10 × 2 × 2 in


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