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Thread: Ain't Broke, Don't Fix It?

  1. #1
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    Ain't Broke, Don't Fix It?

    14.7" CMMG M4 Profile Barrel


    I bought my CMMG back when people had a much higher opinion of them. I’ve been in the Army for about 4 years now, so I haven’t put near as many rounds down its throat as I’d like. But after I get back from “over there” in January I’m pretty much out of the Army & I’m looking into shooting a lot more often “for pleasure”.

    Back when I bought it I broke it in with 180 rounds of XM193, then 500 rounds of Wolf Polymer for a total of 680 rounds. I never had a single malfunction of any type.

    Since I’ve been deployed, I’ve become an avid lurker here on the site. And I was lucky enough to find "the Chart", so I already upgraded to a BCM BCG & H Buffer. The upgraded stuff is waiting for me when I get home.

    Long story short is this. CMMG is notorious for having 5.56 marked barrels but tight .223 ish chambers. Not only could this cause problems with my Wolf stockpile, I just plain don’t like having to worry about that kind of stuff!

    Easy solution right? Send her on down to ADCO and get the chamber reamed for $30. But I haven’t had any problems with it eating my Wolf yet.

    • Am I being overly paranoid?
    • Should I wait till I have a problem, even though I believe in prevention?
    • I know people say no, but “can reaming have any negative effects at all”?
    • Should I just say screw it and buy a BCM or Daniel Defense barrel and call it a day?


    Hey, thanks a lot. This place has been awesome!
    Last edited by e1harris; 12-08-10 at 00:07.
    We few, we happy few, we band of brothers;
    For he to-day that sheds his blood with me
    Shall be my brother; be he ne'er so vile,
    This day shall gentle his condition;
    And gentlemen in England now-a-bed
    Shall think themselves accurs'd they were not here,
    And hold their manhoods cheap whiles any speaks
    That fought with us upon Saint Crispin's day.

  2. #2
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    I'd get rid of it and buy a better quality barrel.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

  3. #3
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    Meh, I would keep it and do nothing unless there is a problem, but if this is a more serious use rifle and not a range gun then sure get a BCM barrel and be done with it.
    Danga Zone!

  4. #4
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    I'm sure the SMEs will chime in soon. You may want to just save up some money and order a BCM upper or Daniel Defense upper since you already replaced the LPK with Grant's goodie bag of lower parts. Then sell your CMMG upper at a gun show maybe. Or as already suggested sell the whole thing and get a whole new weapon from BCM, DD, Noveske, Colt, or LMT. I went through the same thing with my Franken AR and ended up selling and getting a DD M4V1. And thanks for your service, if you're ever in the DFW area drinks are on me.

  5. #5
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    I think I've decided to have some fun. I havn't had any problems yet, and who knows, maybe I never will.

    I've decided "If it ain't broke, don't fix it".

    But what I am gonna do, is put the rifle through its paces and see how it does in the face of adversity.
    • I’m gonna clean‘er up real good
    • I’m gonna take‘er out to the range
    • I’m gonna keep’er well lubed
    • I’m gonna shoot 500 rounds of Wolf without cleanin‘er


    If I have issue with shells getting stuck in the chamber I’ll send it to ADCO to get reamed, then repeat the test when it gets back.

    If she gets back reamed and still has problems……………..


    Hello new BCM 14.5” Middy!!!



    Either way, I’ll have fun at the range! (either way, I’ll end up with a BCM 14.5” middy sooner or later)
    We few, we happy few, we band of brothers;
    For he to-day that sheds his blood with me
    Shall be my brother; be he ne'er so vile,
    This day shall gentle his condition;
    And gentlemen in England now-a-bed
    Shall think themselves accurs'd they were not here,
    And hold their manhoods cheap whiles any speaks
    That fought with us upon Saint Crispin's day.

  6. #6
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    or, for a little more money, you could get this and never look back...

    http://www.aimsurplus.com/product.as...96&groupid=103
    Last edited by ra2bach; 12-08-10 at 01:06.
    never push a wrench...

  7. #7
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    Quote Originally Posted by ra2bach View Post
    or, for a little more money, you could get this and never look back...

    http://www.aimsurplus.com/product.as...81&groupid=103
    I hear ya, and you know what... you're absolutely right. However, I think I have it stuck in my head that it's principle.

    I shouldn't have to replace a barrel that only has 680 rounds through it. I feel like I have to give this lettle fella a fightin' chance. What if I got one of the 3 out of 10 good barrels that CMMG made?


    I kinda feel bad raggin' on CMMG as I havn't even had a single malfunction yet, (I just didn't know about their "tight" chamber reputation till 4 years after I bought the rifle)
    Last edited by e1harris; 12-08-10 at 01:11.
    We few, we happy few, we band of brothers;
    For he to-day that sheds his blood with me
    Shall be my brother; be he ne'er so vile,
    This day shall gentle his condition;
    And gentlemen in England now-a-bed
    Shall think themselves accurs'd they were not here,
    And hold their manhoods cheap whiles any speaks
    That fought with us upon Saint Crispin's day.

  8. #8
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    Quote Originally Posted by e1harris View Post
    If I have issue with shells getting stuck in the chamber I’ll send it to ADCO to get reamed, then repeat the test when it gets back.
    Kindly bear in mind that I'm positioned toward the bottom of the "Expert Opinion Scale." That said:

    - It sounds as if you measured the chamber 680 times and found it to be in-spec.
    - If the chamber were out-of-spec, would you not know it by now?
    - Could you put your mind at-ease with a micrometer, headspace gauge or phone call to ADCO?
    - If ADCO reams the chamber, you'll lose whatever "Oh My God, Interplanetary Nitride Treatment" that CMMG was hawking as the greatest thing since the Champagne Room.

    I'm with you regarding the idea of putting another 500 rounds (perhaps more) through it before doing anything else. And anybody who can quote the Saint Crispin's Day speech in their signature is alright with me, by the way.

    Now, you do realize what's going to happen now, don't you? Armed with your original logic, you're going to buy another upper to put on that lower. You're then going to stash the old upper in a closet. After a while, you're going to think about that upper and how it's probably cold, frightened, lonely... and wondering what it did to make you angry. Then you're going to find a budget lower to put under your original upper so it can be part of the family again. Now they've multiplied. It's just the natural pathology of the disease.

  9. #9
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    And by the way... someone sells a gauge for the purpose of determining if a chamber is 5.56mm or .223, something I just learned about a minute ago.

    http://www.m-guns.com/tools.php

  10. #10
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    I have a CMMG that I bought earlier this year and have put over 600 rounds through mix of .223 and 5.56mm and have had no failures. Through this site I have learned a great deal and plan on getting a new rifle to supplement my CMMG. CMMG will either be sold or kept as a backup or for a friend that wants to shoot along with me. All in all can you ever have enough guns? If you have the itch to get another one then scratch away.
    Last edited by pcardinal42; 12-08-10 at 02:57.

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