We are so confident in our barrels that we offer a 100% money back guarantee within 90 days of purchase. If our barrels don’t meet or exceed your expectations, for any reason, return it for a full refund.
Allow us to reintroduce ourselves. We have brought back our Mountain Series of barrels for those of you who want the accuracy you expect from Rainier Arms in a nearly indestructible package. These barrels are made out of 4150 CMV and nitrided as well. That means these barrels will take anything you can throw at them. They are meant to be shot, and shot a lot. The half-fluted profile maximizes heat dissipation and helps reduce weight.
Specifications:
4150 CMV Steel
Length: 14.5”
Twist: 1:7
Thread Pitch: 1/2x28
.750 Gas Block Seat
5.56 NATO Chamber
Mid length Gas System (Gas Tube not Included)
M4 Feed Ramps
Half-Fluted Profile
Weight: 1.80 lbs.
Our Craftsmanship
Rainier barrels are meticulously designed and machined by precision gunsmiths. Our barrels are turned the same way true artisans have made premium rifle barrels for over a century. Each barrel has hand-cut chambers and crowns with the attention to detail that can only come from highly trained human intervention. While most companies strive for faster production time to cut costs, we strive for perfection. There are no shortcuts with our barrels, period.
Review by Bryan M. on 14 Mar 2025review stating Lives Up To the Hype
I have 3 Rainer Arms Barrels and plan to Buy More. I have the Rainer Arms select barrel amazing barrel some how every ammo i put in the select is sub MOA 50-10 yards. I Pland on picking up more of those good deal for 200 bucks. I have two of the mountain mod2 a 16 in and liked it so much i got a 14. 5 not as accurate as the Select but very close. ...Read MoreRead more about I have 3 Rainer Arms Barrels and plan
This is 100% a hard use barrel that will preform well. All the testing/shooting i have done over the 2 years i have owned it , this barrel has met my expectations. Pair this with the rainer arms bcg for best results. Thanks Rainer Arms. Read LessRead less about I have 3 Rainer Arms Barrels and plan
Q: A previous question asked about the dimpling of the barrel, and the reply was that it is dimpled. My question is are there two dimples and if so how apart are they?
Rainier Arms
07/22/21
A: We only do a single dimple, as there are a number of different screw spacings depending on the manufacturer. We do the rear dimple, opposite the gas port as that location is identical on all gas blocks.
M
Mike
Verified Reviewer
02/18/21
Q: Is this just a 5.56 barrel or is it .223/5.56?
Rainier Arms
04/15/21
A: This is chambered in 5.56 but will also function with .223 Remington ammunition.
C
Chris M.
Verified Reviewer
01/09/21
Q: So is this a heavy profile barrel?
Rainier Arms
04/13/21
A: This is not marked as an HBAR and is our own proprietary profile.
F
Fuckin1984
Verified Reviewer
01/07/21
Q: Does Rainier Arms dimple their barrels for the use of set screws in applying a low profile gas block?
Rainier Arms
04/13/21
A: The barrel is dimpled to help with gas block installation!
Review by Bryan M. on 14 Mar 2025review stating Lives Up To the Hype
I have 3 Rainer Arms Barrels and plan to Buy More. I have the Rainer Arms select barrel amazing barrel some how every ammo i put in the select is sub MOA 50-10 yards. I Pland on picking up more of those good deal for 200 bucks. I have two of the mountain mod2 a 16 in and liked it so much i got a 14. 5 not as accurate as the Select but very close. ...Read MoreRead more about I have 3 Rainer Arms Barrels and plan
This is 100% a hard use barrel that will preform well. All the testing/shooting i have done over the 2 years i have owned it , this barrel has met my expectations. Pair this with the rainer arms bcg for best results. Thanks Rainer Arms. Read LessRead less about I have 3 Rainer Arms Barrels and plan
