.300 Blackout 14.5″ M4 Barrel – Pistol Length

Rated 3.50 out of 5 based on 2 customer ratings
(2 customer reviews)


  • BARREL LENGTH: 14.5″
  • CALIBER: .300 Blackout
  • TWIST RATE: 1:7
  • MATERIAL: 4150 Chrome Moly Vanadium
  • FINISH: Parkerized
  • GAS SYS: Pistol
  • MUZZLE THREAD: 5/8-24
  • ADDITIONAL SPECS/NOTES: Not compatible with any other Caliber

In stock

UPC: 640901516417 SKU: B2-K004-C005 Category: Tags: , , , , , , ,


The 14.5″ .300 Blackout M4 barrel is the perfect barrel to start your next build and add to your AM-15 collection. This barrel is made from 4150 Chrome Moly Vanadium Steel with a Parkerized finish. Featuring a pistol length gas system with a .750″ gas port and a 1:7 twist, this barrel provides top accuracy and precision for your .300 Blackout build.

Additional information

Weight 1.66 lbs
Dimensions 15 × 1 × 1 in

2 reviews for .300 Blackout 14.5″ M4 Barrel – Pistol Length

  1. Rated 5 out of 5

    Scott Rice

    This is a excellent Barrel.
    I built this AR with an Anderson arms upper and lower receiver. 120 grain Factory Remington up to 220 grain Factory Federal subsonic function flawlessly in this Barrel and this is without a suppressor.
    So far my best group is 1/2″ at 100 yards with Hornady 150gr FMJ-BT going 1980fps and everything has been under 1 1/4″
    If you want a 300 AAC Blackout you can not go wrong with this Barrel.

  2. Rated 2 out of 5


    Maybe I got a dud, but this thing throws a lot of flyers. At first I thought it was the first shot, but that isn’t so. It’s completely random, and very unpredictable. Cold barrel, warm barrel, clean, dirty, etc. It just isn’t consistent. NOT GOOD for trying to pop coyotes and the bullet goes 8″ high and left, or is it 6″ low and right? Who knows … this barrel sure doesn’t. To be fair, I’ve only shot Nosler Match Grade 220gr subs (by far the worst groups), and Hornady A-max 208gr subs (much better 1-1.5″ groups, except the random 6-8″ flyer) through it. Need to do more testing w/ lighter bullets, but the whole point of the tighter twist was to go with heavier subs. Anderson, are you listening?

    • Tom Steffner

      Following is the necessarily barrel break-in procedure to ensure reliable and consistent accuracy from your new rifle or Barrel:

      1. Shoot one round and then clean
      Do this for the first ten rounds.

      2. Shoot three rounds and then clean
      Do this for the next fifteen rounds.

      3. Shoot five rounds and then clean
      then shoot a fouler round
      and then shoot three rounds for accuracy.

      NOTE: Allow barrel to cool to ambient temperature before shooting each series of break-in rounds to avoid unnecessary throat erosion. Do not shoot your rifle in succession until the barrel is too hot to touch with a bare hand.

      When cleaning, use these simple instructions:
      Use a quality one-piece cleaning rod.
      Use a bore guide.
      Clean from chamber end only.

      DO NOT:
      Use a stainless Steel bore brush.
      Leave strong ammonia cleaning products in your bore for extended periods of time – additionally, do not allow solvents to contact stock as it can remove the finish.
      Once the barrel is broken in, remember to clean the barrel after approximately every 20 to 40 rounds to keep accuracy optimal. A dirty bore is a primary cause of poor accuracy.

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