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Thread: FTF with New Gun (Pics) *Update on p.3*

  1. #21
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    Oct 2008
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    Did you purchase the lower complete or build it up?

  2. #22
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    Jul 2007
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    Complete lower. All I did was slip a stock onto it.

  3. #23
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    I've never had a bad BCM BCG... but, did you check your gas key?
    Sound's like it's under gassed.

    Recoil spring length?
    A2 spring in a carbine extension?

    LUBE? Wet and ready to party? or Dry and ready for a nap?
    Hope/Pray for the best, be prepared for the worst... but when the ball drops... go barbarian.

  4. #24
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    Oct 2011
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    Florida, CSA
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    Quote Originally Posted by TheGhostRider View Post
    I've never had a bad BCM BCG... but, did you check your gas key?
    Good point. Unless I'm mistaken there was another thread here, or on TOS, where a BCM carrier had a broken bolt on the carrier key.
    BCM resolved the problem quickly.
    It happens.

  5. #25
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    Quote Originally Posted by TheGhostRider View Post
    I've never had a bad BCM BCG... but, did you check your gas key?
    Sound's like it's under gassed.

    Recoil spring length?
    A2 spring in a carbine extension?

    LUBE? Wet and ready to party? or Dry and ready for a nap?
    gas key = staked, solid, screws intact
    recoil spring = carbine
    lube = party time

  6. #26
    Join Date
    May 2010
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    Way out!
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    Quote Originally Posted by mr_blond View Post
    Well, unfortunately the problem doesn't seem to be the ammo. I had several more malfunctions. With the Guat, they were mostly failures to chamber a round. It wasn't even bolt-overs this time, it was the bolt closing on an empty chamber, with rounds still in the inserted magazine. The top round in the magazine ended up looking like this:

    Unless my eyes are deceiving me, the left side feed lips on that magazine look mighty funky. The small portion at the front appears to be bent up, and the long portion at the rear seems to be bent in, and probably down, at the front. If it's not a optical illusion, seems like those two defects could make for some interesting feed problems.
    Last edited by M90A1; 12-11-11 at 19:51.

  7. #27
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    Good catch, also it looks like the round on the right is not parallel to the chamber. Looks like the tip is pointing up and not sure where it will end up oriented when it's next in line. Also the BCG doesn't look wet enough but it could just be the picture.
    NRA Lifetime Member
    Firearms and Diesel Trucks....the left's worst nightmare!

  8. #28
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    The same mag:




    Also worth noting is that all rounds chambered upon pulling back the CH and releasing, and that the same malfunctions occurred with brand new magazines, which I have eyeballed, and are in good condition. Looking at the steel magazine right now, the feed lips look fine.
    Last edited by mr_blond; 12-11-11 at 20:17. Reason: clarity

  9. #29
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    I have never shot the ammo you are using but it looks like the bolt is traveling too slow at the end of it's retraction so it could be under powered based on the design intent for xxx type of round. Think of the mag spring starting to push the round while the blot is still at the rim of the casing. If it were me the first thing I would do is check the spring length and trade out the buffer to a standard weight. This will allow faster travel time closer to the end of the BCG's retract. Keep us posted .
    NRA Lifetime Member
    Firearms and Diesel Trucks....the left's worst nightmare!

  10. #30
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    Jun 2006
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    One last thing you could look at is the magazine catch. Make sure it’s installed properly. If it’s not turned in far enough it can cause feeding issues. The end of the catch should be flush with the button.
    Certified Glock Armorer

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