CMMG .300 Blackout Barrel Multi-Role Profile - 16.1"

Manufactured by CMMG
SKU: 30DF80A
MPN: 30DF80A
Manufactured by CMMG
2 Reviews

Out of Stock



Deciding what barrel to use for your new .300 AAC Blackout build just got easier with this offering by CMMG. Highly durable and designed for reliability, there isn’t a reason why you shouldn’t go with it. The CMMG .300 Blackout barrel is made to exacting tolerances from 4140 Chrome Moly steel and finished with salt bath Nitriding inside and out for ultimate longevity and corrosion resistance. The barrel threads are carefully threaded to the .308 standard 5/8x24 for use with .308 caliber suppressors. The .750" gas journal is carbine length to ensure plenty of dwell time for reliability with full power and sub sonic loads. The .300 Blk Barrel twist rate is a tight 1/7 twist, optimized for stabilizing the heavier bullets used for subsonic loads. If you are looking for the right barrel to build a suppressed .300 BLK rifle, you just found it.

  • .300 AAC BLK chamber
  • Machined from 4140 Chrome Moly steel with Nitride finish
  • 5/8x24 threads for compatibility with .308 muzzle devices
  • Carbine length gas system optimal for reliability
  • 1/7 twist rate for heavy sub-sonic bullets
  • M4 feed ramp barrel extension
  • Great for building a suppressed rifle

A leading manufacturer of AR-15 rifles, kits, and accessories, CMMG Inc. was established in 2002. Constantly pushing the edge, CMMG strives to develop and improve bringing you a product lineup that is second to none.
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Barrel CoatingSalt Bath Nitride
Barrel ContourMulti-Role
Barrel Length16
Barrel LiningSalt Bath Nitride
Barrel Material4140 Chrome Moly Steel
Caliber Gauge300 Blackout
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthCarbine
Thread Pattern5/8 X 24
Twist Rate1:7
Weight28.8 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

2 reviews

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nice barrel


I purchased one of the barrels and must say fit and finish are good, after developing a load using nosler 125 bt with w296 powder I am seing 1/2 moa at 100 yds. My new deer hunting round, can't hardly wait for deer season

cmmg barrel


Well I have not shot my rifle yet so I cant give a good review