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Thread: Malfunction help

  1. #11
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    Quote Originally Posted by F-Trooper05 View Post
    Well I tried an H2 buffer, and a complete Colt lower. Same issue. I contacted BCM, but haven't gotten a reply yet. I'm hoping it's just the bolt that needs to be replaced.

    Here's a video of what's happening...

    That forward assist was all like "Oh he's fixing to actually use me!" Then you dropped mag & racked it. The forward assist was then like "I hate you".

    How many rounds do you have through it?

  2. #12
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    Had similar issue with my PSA premium which has about 700 rounds down range. The difference, happened after cleaning; greasing the BCG (lightly) then trying to load a round. I tried 4 times before I took the BGC and Charging handle back out, applied a generous amount of grease to the BCG. Loaded rounds smoothly afterwards.
    I did notice a gouge in each casing that jammed/failed to feed.
    Could the problem be that the tolerances are still very tight thus mandating extra grease (lube)? PSA has not returned calls nor emails so I go with a heavily greased BCG for now.
    Kind of a bummer when all write ups and or videos show a "thin light" coating of oil or grease. I use high temp wheel bearing grease now by the way. The old trusty Hopped gun oil I use on my sidearms was too thin.
    Thanks in advance, this is my first M4 which is mil-spec.
    John

  3. #13
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    Quote Originally Posted by collapse502 View Post
    Had similar issue with my PSA premium which has about 700 rounds down range. The difference, happened after cleaning; greasing the BCG (lightly) then trying to load a round. I tried 4 times before I took the BGC and Charging handle back out, applied a generous amount of grease to the BCG. Loaded rounds smoothly afterwards.
    I did notice a gouge in each casing that jammed/failed to feed.
    Could the problem be that the tolerances are still very tight thus mandating extra grease (lube)? PSA has not returned calls nor emails so I go with a heavily greased BCG for now.
    Kind of a bummer when all write ups and or videos show a "thin light" coating of oil or grease. I use high temp wheel bearing grease now by the way. The old trusty Hopped gun oil I use on my sidearms was too thin.
    Thanks in advance, this is my first M4 which is mil-spec.
    John
    I believe this to be a common problem with mil-spec M4's. Probably part of the reason some people view the platform as unreliable. Most barrel-extensions are not properly profiled, which I have encountered. Only my Daniel Defense is done correctly on the factory guns I have, although I have seen others. Seems to be several sources of barrel extensions and some are done right, some are not. This is overcome with stiffer springs, more lube, and other bandaids...or properly profiling the barrel-extension.

    This is how a barrel extension normally looks:


    This is the result:

    (or what OP describes, bullet in chamber, but the denting and scraping slowed BCG velocity so much that the extractor did not snap over the rim as it BARELY chambered)


    This is how it needs to look to be reliable:

    Notice how pretty my Daniel Defense barrel extension is? No way for anything to get dug into or hung up on that! Feeds like buttah!
    A file and some patients can get you there.
    Last edited by WS6; 03-27-14 at 05:46.

  4. #14
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    Hey thanks brother. What exactly am I filing? I am new to the AR15 community, still a lot to learn. Or, should I attempt to get PSA to repair the problem?
    thanks again,
    John

  5. #15
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    Quote Originally Posted by collapse502 View Post
    Hey thanks brother. What exactly am I filing? I am new to the AR15 community, still a lot to learn. Or, should I attempt to get PSA to repair the problem?
    thanks again,
    John
    First, verify the issue. Second, it is the sharp corners on the sides of the feed-ramps. Maybe file is a strong word...polish...you can't add it back...

  6. #16
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    Quote Originally Posted by WS6 View Post

    Notice how pretty my Daniel Defense barrel extension is? No way for anything to get dug into or hung up on that! Feeds like buttah!
    A file and some patients can get you there.
    Patients??? Sorry just thought that was funny. It's early.

  7. #17
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    Quote Originally Posted by eperk View Post
    Patients??? Sorry just thought that was funny. It's early.
    Sorry, I hardly ever write patience. I write "patient" dozens of times a night.

  8. #18
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    Quote Originally Posted by WS6 View Post
    Sorry, I hardly ever write patience. I write "patient" dozens of times a night.
    lol I can relate. 30 years as a Vol. Fire Fighter Heavy Tactical Rescue member, I too mix the spelling up.
    Okay, So the two lower grooves (ramps) is the area to work with the dremel using the firm wool polishing Bob and some metal polish. I have used the red polishing stick from dremel when polishing the copper base of spent rounds prior to making them into necklaces for people (the 180gr HST has been a big hit). Should I use the same or maybe Menzerna medium cut compound?
    Thanks,
    John

  9. #19
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    I'd use a jewelry file or nail care kit or something. You're just breaking a corner that's gouging.

  10. #20
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    If its a factory BCM upper I would have them replace it first, if it happens with that one too then I start taking the jewelers files to it. Or just pick up a DD barrel or similar.

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