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Thread: Max gas tube length for 14.5" barrel?

  1. #21
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    I have not tried Centurion ammo but I did read this on another site:

    i purchased 1000 rounds of centurion from atg and would not buy again.out of the first few clips i noticed seating depth was all over the place some would not even fit into the mag (cproducts stainless).then the wife was shooting and bang bang bang nothing. i took the weapon and tried to pull the charge handle with no luck. dropped the mag seperated the lowers took a screwdriver to gently pry back the bolt and i found a live round with a case neck that was badly bent. i then hand picked each round for the rest of the day which worked great. however i ended up throwing away approx 50 rounds that day that had bent case necks,improper seating depth that was way off or case necks that were doubled over. one of the bullets i was able to easily hand pull out of the case. i have approx 400 rounds left and after sorting them i found another 20 rounds that are toast. buyer beware the QA process from centurion is less than acceptable go with prvi or federal.

  2. #22
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    any leaks around the FSB? What are you using for buffer and spring? Does it fail to cycle everytime or sometimes?

  3. #23
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    No gas leaks. I am running a mil-spec recoil spring with standard buffer. It fails to cycle every time. I presently have a bolt action AR.

  4. #24
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    Quote Originally Posted by jsebens View Post
    I think the problem is not with CMMG's parts, but with their QC post/during assembly. I've seen multiple problems on multiple CMMG guns that could have been avoided by a 30 second scan of the gun, and were immediately spotted by the buyer. Hell, they sent me mine missing parts.

    CMMG makes great parts. These days, that's as far as I'd trust them...in my house, CMMG is a four letter word.
    The only thing from CMMG is the barrel assy. How bad could someone screw that up? I am wondering if the problem is under the FSB with the gas port. I bought the barrel back in October before the post election frenzy and assembled the rifle just 2 weeks ago. I am dreading calling CMMG because I have heard their CS blows right now. Anyway, thanks for the replies guys.
    Last edited by 1811guy; 03-02-09 at 21:58.

  5. #25
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    They screwed up my barrel assembly; improper headspace on the barrel extension. Just saying it's not impossible.

  6. #26
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    Something to think about when troubleshooting. Yes, the ammo may be fine or maybe it isn't rather than spend needless amounts of money and dicking around it is highly advisable to procure some other well-known ammo and test it. Every ammo manufacturer has put out crappy ammo before, just like every top line gun maker has rolled out a lemon.

    So, the first thing I would do is get some other ammo, probably two different types and shoot it. Second, I would then check and see if there is any change that you may have made that could have caused the issue. We see it here all the time. Somebody got a cool guy buffer, a super duper high power spring and the latest multi-cool this or that and then their weapon quit running. Make sure that you mags are good to go as well.

    If that fails then contact CMMG, explain the problem and articulate to them the steps that you have taken to fix the problem. At that point send it back if necessary.

    MANUFACTURERS WILL CONTINUE TO BUILD AND SELL CRAP UNLESS THEY ARE HELD ACCOUNTABLE. IF YOU DON'T ADDRESS THE ISSUE THEY WON'T FIX IT.



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  7. #27
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    Quote Originally Posted by markm View Post
    Shit. I've seen 16" barrels with a rifle gas system that will work.
    where did you see this?

  8. #28
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    Quote Originally Posted by trinydex View Post
    where did you see this?
    I've seen several too. If you look at the dissy threads on ARF there's a few guys that run this system.

    I have an instructor who is running this exact set up. I'm skeptical of it. I'm building a dissy style gun now with a middy shaved gas block under rifle handguards with the FSB in the rifle position.
    Last edited by markm; 03-03-09 at 16:54.

  9. #29
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    Quote Originally Posted by markm View Post
    I've seen several too. If you look at the dissy threads on ARF there's a few guys that run this system.
    I have an instructor who is running this exact set up. I'm skeptical of it. I'm building a dissy style gun now with a middy shaved gas block under rifle handguards with the FSB in the rifle position.
    Don't all those run shaved gas blocks under the HGs, either carbine or middy?

  10. #30
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    i thought the definition of a dissy was a barrel that used an fsb at rifle length but used a carbine gas (didn't ever understand why it wasn't a middy gas).

    anyway, i knew about dissys just didn't know that you could run a rifle length gas on a 16" the least i'd heard of was 17" barrel with a rifle length gas system, i this is a popular lilja that's made or something.

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