18" 5.56 Fluted Barrel

Current stock: 0


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.


Reviews (3)

Gary Johns 13th Jun 2018

Stag 3GL upper

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!!!

Jeffrey S Reynolds 18th Sep 2017

3GL barrel

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.