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Thread: Issue with rifle surfaced during training course, report

  1. #41
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    strange problem, have you tried it with a different buffer spring that is known to work?. Perhaps when it is loaded to full there isnt enough spring force to feed the top round. The top round is the tightest bullet on the stack when its full obviously, so maybe there is an issue there.

  2. #42
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    I hadn't considered that. The buffer spring was bought new from Rainer arms. So your saying I should try another carbine buffer spring?

    Let me ask another question. Does anyone think that the issue I was having with the original bolt release getting beat up has anything to do with the failure to feed I'm having?

    Thanks

  3. #43
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    If the bolt catch is somehow creating drag on the bolt carrier it could be an issue.

    Many LEO's load their mags to 28 rounds, mainly because they are easier to insert on a closed bolt, but also for the reason you describe. Yes, I am aware that HK and P-Mags will compress the rounds a little farther than GI mags making them easier to insert when the mag is fully loaded. Even so many LEO's only load them to 28 rounds.

    There are many factors involved here. Obviously more pressure is being applied to the bottom of the carrier than the buffer and "buffer spring" can overcome. This pressure comes from the fully loaded magazine, the height the magazine is held at, the hammer spring (for the short duration the hammer is applying pressure to the bottom of the carrier)... Again, several factors. I would try the upper on someone elses' gun that has a lower configured similar to yours. If it works on their lower then I would try their buffer and buffer spring in your lower. Absent that I would buy an extra power buffer spring and possibly heavier buffer.

  4. #44
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    if it was me, i'd do the following:

    -pull my bolt-catch spring and make sure it's really a bolt-catch spring, replace if at all questionable
    -check bolt-catch protrusion- i don't know what the max end is, but the only weapon i have with me right now just mic'd to .2125".. so probably any higher than .2200, maybe a little more, may indicate an out of spec lower
    -install a different buffer spring and try again
    -install an XP spring and try again

    i've had XP springs make non-functional guns into functional guns. this is almost always simply compensating for something else being screwed up, but that's what they make them for.
    Last edited by bkb0000; 10-02-10 at 19:43.

  5. #45
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    Great info bkb000. I will try what you said. Like I said before if it has to go back that's fine, I would just like to exhaust all othe avenues first. I also don't like the idea of using stronger springs to overcome out of spec tolerances, but I would like to get the gun to run correctly first.

  6. #46
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    If you suspect the bolt catch you may want to try it with the bolt catch removed. Just leave it off when you remove it to check the spring as bkb0000 recommended. This may help isolate where the problem is.

  7. #47
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    im not seeing how a bolt catch would interfere with feeding the first round. Springs can be defective, more rare tho. Just worthwhile to check.

  8. #48
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    Quote Originally Posted by ForTehNguyen View Post
    im not seeing how a bolt catch would interfere with feeding the first round. Springs can be defective, more rare tho. Just worthwhile to check.
    if it's dragging the bottom of the carrier, it'll slow it down enough to stop it, slow it down, prevent lockup, etc. bad catches/springs and/or out of spec lowers do cause failures to feed. if it's only dragging a little, it'll only effect the first round, because the carrier does not have the additional inertia of cycling during firing.

    weird things happen with this platform from time to time- and m4c is where they're gonna pop up.

  9. #49
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    Quote Originally Posted by ForTehNguyen View Post
    im not seeing how a bolt catch would interfere with feeding the first round. Springs can be defective, more rare tho. Just worthwhile to check.
    I tend to agree, but he did have unusual gouging on his original bolt catch and his new one has some surface finish removed in the same pattern as the gouging on his original. It appears that the bottom of the bolt or carrier is contacting/riding across the top of the bolt catch. Unknown if this is occurring all the time, or just when the bolt is released from the bolt catch. Why not eliminate the bolt catch as the cause of his malfunction just to give him peace of mind?

  10. #50
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    Testing now. Will report back shortly

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