Rainier Arms mountain series

[BufordTJustice]

I shot several thousand through my 18" with rifle gas. Ran on setting 6 from full closed (out of 15) on my SLR rifle works gas block with an LMT e-carrier and A5H4 buffer. Literally never had a malf. I sold it to a buddy in favor of Faxon's lighter gunner profile.

Buddy is still using it and it still runs like a scalded dog. Smooth shooter, too.

[AndyLate]

I'm resuscitating this thread rather than starting a new one. Rainier has the mountain chf barrels at a VERY attractive price right now. Is there any reason I should avoid the 18" rifle gas barrel for a "SPR" type build? Use would be 90% range, 10% hunting (deer/coyote) and scaring prairie dogs.

Thanks
Andy

[alx01]

I think Rainier Arms has an excellent track record with their CHF barrels and their other precision line. If I could find one shorter I would definitely buy it at its current price. They also have an excellent customer service. I would absolutely not hesitate to buy one if it suits your purpose even for a hard use, not just a range toy.

I'm resuscitating this thread rather than starting a new one. Rainier has the mountain chf barrels at a VERY attractive price right now. Is there any reason I should avoid the 18" rifle gas barrel for a "SPR" type build? Use would be 90% range, 10% hunting (deer/coyote) and scaring prairie dogs.

Thanks
Andy

[TehLlama]

I'm resuscitating this thread rather than starting a new one. Rainier has the mountain chf barrels at a VERY attractive price right now. Is there any reason I should avoid the 18" rifle gas barrel for a "SPR" type build? Use would be 90% range, 10% hunting (deer/coyote) and scaring prairie dogs.

Thanks
Andy

For your application, I'd argue that's a pretty ideal setup.
I wouldn't consider rifle length to be a drawback for that - only way to cause issues is to run underpowered .223 on a heavy buffer setup, even then it'll actually run well if clean/lubed well.

[AndyLate]

Thank you, alx01 and TehLlama

It will replace the 20" Faxon Gunner barrel I am currently running (which is going to be used in an A1 ish build)

The rifle will have an A5H2 buffer with a standard rifle recoil spring.

Andy

[Run N Shoot]

I love my 16” upper with the Mountain series barrel. Very accurate and I like the profile. As mentioned, Rainiers Customer Service is top notch.

[AndyLate]

An update - I ordered a "standard weight" 18" Mountain Series barrel from Rainier Arms and mated it with a .750 Troy gas block, ALG rail, and BRT linear compensator.
I zeroed the rifle today with Hornady 75 gr 5.56 at 100 yards and shot some mild 55 gr handloads and Norma 55 gr .223.
The barrel definitely has potential, but I was not shooting my best. I would pull one shot from each 5 shot group (knowing I pulled it) and have the other 4 rounds touching each other. I shot a 10 round group with 8 rounds into one big hole and two called shots an inch away in different directions - very frustrating.
The rifle was problem free and oh so nice to shoot with an A5H2 buffer and rifle action spring. Scope is a Vortex 2.5-10x32 PST.

Post Script - I just saw on Rainier's site that the gas port on the 18" barrels is .089.

Cell phone pic at the range with my LMT carbine:

[SwampYankee]

Nice rifle(s). Good to hear you think they have good potential for accuracy, I bought some of the 16 inch mid weight uppers and had some 13 inch Mk8 G rails installed. Now just waiting on the gen 2 viper PST. 1-6

[Eurodriver]

with my LMT carbine:

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