18" 5.56 Fluted Barrel

(5 reviews) Write a Review

The 18" 5.56 NATO barrel has a heavy barrel profile with fluting running down the length of it. It is the same barrel used on our Stag 15 3Gun Elite rifle. The barrel is made of 416R Stainless Steel and has a 1/8 twist. The barrel extension is pre-installed and headspaced.


Caliber: 5.56 NATO | .223

Length: 18"

Weight: 2.4 lbs

Diameter at the gas port: .750"

Barrel Threading: 1/2 x 28

Barrel Profile: Heavy barrel

Barrel Material: 416R Stainless Steel

Twist Rate: 1/8

Bore & Barrel Lining: None

Barrel Coating: None

Gas System: Rifle Length Direct Impingement

SKU: STAG400018


Q: Will this work with my upper receiver?

A: The barrel will work with any mil-spec upper receiver.

Q: Do you provide instructions on how to install the barrel?

A: Unfortunately we don't provide directions on how to install a barrel and recommend that it be installed by a gunsmith to prevent damage to the rifle.

Q: Do I have to purchase a matched bolt to my barrel?

A: With AR-15's as long as you are using the proper bolt for the caliber you do not need to match a bolt to the barrel.

5 Reviews

  • 5
    Great barrel

    Posted by Gun guy knox Tn on 13th Apr 2021

    I am absolutely over satisfied with the purchase of this barrel nice finish super accurate Not to heavy just all around great quality. Thanks for the great product

  • 5
    SPR Build

    Posted by Virgil on 9th Apr 2021

    Beautiful barrel. Packaging is simple but no damage upon arrival. Haven’t installed yet due to other parts not on hand. But overall, satisfied. And price is very competitive I might add. Thanks.

  • 5
    Stag 3GL upper

    Posted by Gary Johns on 13th Jun 2018

    Stag had a sale on this upper and I scarfed it up quick. I have a Stag 16” carbine but wanted something a little better for coyotes. My lower already has a Geissele SSA-E trigger so this was all I needed to make me a nice small varmit rifle. First time out with it using 55gr factory ammo produced 5 shot groups at 1” at 100 yd indoor range. That’s plenty good for my purposes. Absolutely love Stag Arms rifles!!!

  • 5
    3GL barrel

    Posted by Jeffrey S Reynolds on 18th Sep 2017

    Excellent fit and finish. Great accuracy and now I have 2 stage 3GL to compete with. Couldn't ask for a better barrel with it's accuracy for the price.

  • 5
    Good Barrel

    Posted by Hendo on 22nd May 2017

    I have had this barrel for about two years with about 2k rounds out of it. It consistently shoots 1.25 MOA at 200 meters and usually shoots touching groups at a 100 meters and under. I have had zero reliability issues with this barrel utilizing a Superlative Arms adjustable gas block. The machine work was good and I am happy with this purchase. The only thing I would change is I would upgrade it to 416 stainless instead of 410, this is mainly for longevity. But most people wont shoot enough to see this difference. Some people worry about "stingers" with 410 Stainless but I have not had that problem with this barrel. It has been fired in 110 degree 100% humidity in Georgia, and 10 degrees with 20% humidity in Kansas and I have never had a problem with it. It is a little bit heavier than the Faxon and the Ballistic Advantage but the price is also cheaper. You will not go wrong with this barrel for competition or hunting. I also have a Stag bolt that I use with this barrel.