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: 12.5”
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: 1.54 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 Chris G. on 30 Dec 2024review stating Unexepected performance!
Installed and tested for groups at 50 yds for 50/200 zero using Razor 1-6. 55's gave 3/4". 69's had 3 rd cluster with 2 fliers touching maybe 1/2" offset. 77's were all 5 in a clover leaf. Walked it out to 500 and was able to consistently score hits on silhouette. Had Polonium K direct threaded. Size and weight were great. Flutes are incredibly de...Read MoreRead more about Installed and tested for groups at 50
ep. Minimal heating was observed during two mags of rapid fire in doubles and triples. I'm in love. Just ordered another. . . Read LessRead less about Installed and tested for groups at 50
Review by Benjamin Z. on 20 Feb 2021review stating shipped and arrived within 3
shipped and arrived within 3 days. barrel looks amazing i truly appreciate the craftsmanship. another note i like the weight as well its heavy enough it feels tough and durable but not so heavy that it feels tiring to operate the rifle.
Review by Chris G. on 30 Dec 2024review stating Unexepected performance!
Installed and tested for groups at 50 yds for 50/200 zero using Razor 1-6. 55's gave 3/4". 69's had 3 rd cluster with 2 fliers touching maybe 1/2" offset. 77's were all 5 in a clover leaf. Walked it out to 500 and was able to consistently score hits on silhouette. Had Polonium K direct threaded. Size and weight were great. Flutes are incredibly de...Read MoreRead more about Installed and tested for groups at 50
ep. Minimal heating was observed during two mags of rapid fire in doubles and triples. I'm in love. Just ordered another. . . Read LessRead less about Installed and tested for groups at 50
Review by Benjamin Z. on 20 Feb 2021review stating shipped and arrived within 3
shipped and arrived within 3 days. barrel looks amazing i truly appreciate the craftsmanship. another note i like the weight as well its heavy enough it feels tough and durable but not so heavy that it feels tiring to operate the rifle.
