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Thread: Malfunction diagnosis

  1. #11
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    Probably the mag spring, follower tilting and your feed lips might be sharp or distorted. As others mentioned hard to diagnose over the internet. Replace the mag if in question

  2. #12
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    Had this happen on Pops Colt. We unwrapped a new (in the 60's or 70's probably) mag and everything went back to normal. It could still be another problem but I would have tried a new mag right then.
    Appeasement is never the answer in the face of naked aggression.

  3. #13
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    Quote Originally Posted by Col_Crocs View Post
    Likely your mag.
    Ditto

  4. #14
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    Action spring is on the way out.

  5. #15
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    It could be a combination of things. Aluminum magazines have more drag on the round being fed than Magpul mags do. More force is required for reliable feeding with aluminum mags. I can run a heavier buffer (without changing the action spring) on my carbine with Magpul mags.

    It could be that your BCG was getting a bit dry. With aluminum mags, I find I have to oil up my BCG more often (this is using gun oil, like Birchwood Casey's Gun Oil or Rem Oil. Just recently started using Froglube so we'll see how that pans out).

    It could be your action spring is getting worn. I suspect that's what's happening with my carbine. It's just a standard spring and probably is just beginning to sack, leading to the occasional failure to feed with aluminum mags. Same thing could be happening with your AR.

    I may be wrong, but I don't see how a weak mag spring would cause the round to be partially stripped from the mag like this. A weak mag spring should cause bolt overs, rounds to nose dive or to get crossed up
    Last edited by MistWolf; 05-28-14 at 12:28.
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

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  6. #16
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    Are you able to go buy a LGS and pickup a $10 pmag?
    All of this is just advice. You go out and do whatever the f&<€ you want to do.

  7. #17
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    Where are you getting MagPul mags for $10??
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  8. #18
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    How about some details of the rifle/carbine itself?



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  9. #19
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    The action spring shouldn't be worn yet as the gun has less than 500 rounds through it so far. I wonder if a stiffer action spring may have helped in this case however? I guess assuming it wasn't weak ammo

    Ok, since people keep asking, here is the full build:

    Lower: PSA receiver and parts kit.
    ALG ACT trigger
    mil spec 7074 tube, standard carbine action spring with H buffer
    Magpul CTR stock
    MOE+ grip

    Upper: VLTOR MUR upper receiver
    Rainier Arms Match barrel, 16", mid length gas system. Rainier Arms gas block, pinned by RA
    Apex Handguard
    Smith Vortex flash hider
    BCM BCG

    T1 micro with magpul BUIS

    Any other details I am missing?

    The mag in question was an older USGI with a magpul follower. It might have even had its spring replaced recently but I'm not 100% if I did that or not. I thought I put new springs in all my USGI mags when I put the magpul followers in them.

    So the three culprits I am hearing are a weak action spring, under powered ammo or somehow out of spec mag yes?

    I suppose we could throw a gas leak in there too but I really don't think there is enough evidence to suspect that yet.

    ETA: It has run fine with pmags so far. And the rifle was clean with lube visible on the BCG at the beginning of the day FWIW
    Last edited by siegrisj; 05-28-14 at 17:54.

  10. #20
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    It's a PSA action spring from their parts kit? I'd replace that with a BCM or Colt replacement first, they are cheap.

    If it were a gas leak or weak ammo it wouldn't cycle rearward completely and might not strip the round from the magazine to chamber.

    The action spring pushes the action into battery. It should be able to overcome the magazines hold on a round to feed and chamber and overcome any friction the magazine may offer unless the magazine is VERY out of spec or the gun is dry and dirty.


    If it happened a few times on one occasion then I'd replace the action spring, throw the mag(doubtful that it's the problem), lube it good and run it again.
    Last edited by Rifleman_04; 05-28-14 at 18:35. Reason: More info

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