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Rainier arms Ar15 and ar10 barrel review

Kocher

Sergeant of the Hide
Full Member
Minuteman
  • Apr 27, 2021
    189
    48
    Minnesota
    Ar10 build= Aeroprecision Ar10 lower and upper, and hand guard. The gas block was an Odin adjustable low profile.
    The upper was the m5 enhanced and so wasn’t the hand guard. This has what I would think more stability build into the barrel support. I believe Seekins 1st came out with the idea.
    trigger was hyper fire match supper duper expensive flat trigger with adjustable plastic pad finger dealy bob.

    The Ar15 had a seekins lower with a Aeroworks upper w/out the worthless side btton that forces the bcg down on a round that should not go in.. hell if it didn’t chamber the round the first time, perhaps one should’ve investigate Why it didn’t close on the round before getting out a gorilla 8lb hammer and smash it till the chamber closes enough to get a round off! Nah, I got the nonforwards assist upper because o wanted to save weight... and boy was I happy with the final weight.
    The 20 inch 223 barreled upper
    I was the same weight as 16 inch infantry NX15 upper=W/o bcg was 3lbs 12oz
    And my 20inch rainier upper was 3lbs 11oz (w/o a break on the barrel)

    AR10: Began with a mod2 22” 6.5 CM shiny finish.
    Barrel was a very well done.
    The flutes were deep and organized.
    For the size, the barrel is weighted well.
    The chamber was perfect, with no machining marks to be seen.

    Shot over 400 rounds of match grade ammo, most were Barns match burners, but could not get it to group better than 1&1/2 moa.
    140gr Berger match burners.
    new Starline, and Hornady brass.
    Rl16, n555, shooters world long rifle, Big game. Small rifle, large rifle primers, mag and reg primers.

    Tried gas block completely closed, and shot match factory ammo. No go.

    One thing you should all know about rainier arms, they have great c.s. And stand by there products.

    They were very helpful throughout the time I had issues. Had exchanged the barrel, but they were out of stock.

    I normally do varmints and target’s I figured I’d always wanted to try a very accurate 223 barrel so I did a 20 wylde chamber.

    Unfortunately the first barrel had the extension pin on the barrel put in a little bit crooked so the good guys over there sent me one out next day air.
    Replacement barrel Worked perfect no issues no drama. Shot cloverleafs with most of the ammo.
    SW precision rifle (varget comp)
    H335, tac, SW match rifle powders.
    bullets were Nosler and sierra 40 50, 55 grains varmint bullets.
    Did not get a chance to really shoot the heavies yet. Will update once I shoot 69 and 75 I believe is what I have.
    I have some 60 grain vmax i’ve never had before so that’ll be fun.

    I also have a 22 Creedmoor that’s a match not the mod2 and ordered and received a mod 2 6.5 Creedmoor barrel 22 inch but unfortunately that one (6,5 CM mod 2)received with yet again another barrel pin that was not put in Straight.
    This would not allow me to get the barrel in the upper to bottom out ....so I just let them know about that but unfortunately it’s Friday night hopefully they’ll let me know tomorrow maybe they will send a replacement out. Sat..

    The photo below was the one with I believe 55 or 40 grain varmint rounds. All of the ammunition I shot was High grade reloads on my Dillon 650xl.

    These were done with a mix of different cases 223 rem and some more 556 Federal.

    i’ll try next with some 69 grain Sierra‘s and some 68 grain Hornady with some Starline brass.
     

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    Here are some photos of the barrel
    This is the 6.5 Creedmoor mod2 it is a sharp looking barrel to say the least and unfortunately my second time and in a different caliber, different time frame,the barrel pin and the extension was pushed in side ways... just enough to not seat properly.
    These Ar15 and AR10’s can’t have extension barrel pin off-center, as otherwise they will not work with these upper receivers. Things are just too tight in that area.

    And this is not to knock them it’s just a review of what I’ve ran into so others know what to expect but I do expect the same great level of customer service to take care of this issue rather quickly and hopefully I’ll have something up this week with results.
     

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    have been shooting for a bit and took up some p-dog hunting so apologize for no updates:
    Rainier arm stood by there products
    They had an issue with the barrel extensions and they got them sorted
    They allowed me to return the 6.5 creedmoor until I wanted to try a barrel again, I did and went with a 22creedmoor match barrel
    24” and 1/8 twist I believe or 1/7.
    At fist I had some load development issues until I could actually get hold of powder that was correct burn rate. Imr 4350 and sw4350 are the ticket have some 6.5 star ball to try next.
    60grain vmax 41 grn imr 4350 3400ftps

    10shot continual group. And 1 flyer.
    I would say that most would be happy with this at 100 yards, I know I am.
    Will continue to develop and keep shooting.
     

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