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  1. #1
    Plinker

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    Newly built AR's: Failure to Feed?

    I was pretty pumped to break in a new AR, but had one issue you all would probably know all about. Everything works great, except it's not always picking the new round cleanly from the mag. On occasion, the top of the round only barely gets to the barrel, and the BCG dents the side of the brass with the round in an awkward, half-sideways position. With a pull of the charging handle, it'lll eject fine and load a new round, but it's a fairly routine problem at this point.

    is this a common break-in issue? Think it's the new mags? Just need more oil in the BCG? Any other thoughts?

    Thanks!

  2. #2
    Grandmaster Double T's Avatar

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    Could be ammo? Could be a misaligned gas block obstructing the hole causing a short stroke? Improper feed ramp geometry?

    Lots of variables with little info to go on.

  3. #3
    Proud American speedracer302's Avatar

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    I had a similar issue when using low end steel magazines. The mag had a burr that was preventing clean removal of the round from the mag. Switched to P-Mags and the issue was gone.

    Like Double T said, little information but thats my 2Cents.

    Good luck
    "What country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance. Let them take arms."
    - Thomas Jefferson

  4. #4
    Plinker

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    Quote Originally Posted by speedracer302 View Post
    I had a similar issue when using low end steel magazines. The mag had a burr that was preventing clean removal of the round from the mag. Switched to P-Mags and the issue was gone.

    Like Double T said, little information but thats my 2Cents.

    Good luck

    Thanks for the help.

    Here's a little more info. I have good, new p mags. The problem was reduced with a generous amount of lubrication--but not completely solved. Maybe more would help? Do you ever need to lube the buffer or the mag?

  5. #5
    Master sig1473's Avatar

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    Brands:Barrel? BCG?
    "Eis Aner Oudeis Aner"

  6. #6
    Plinker

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    Quote Originally Posted by sig1473 View Post
    Brands:Barrel? BCG?
    Ballistic Advantage and Aero Precision (nickel boron).

    i talked with someone today who asked how many rounds had been through it. The answer is only about 20 (I've only been through the recommended process for breaking in a barrel from BA). He suggested to take my time working through 100 rounds and then he'd bet this issue would resolve itself. Thoughts?

  7. #7
    Sharpshooter

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    Start with the easy stuff first. Since you have ruled out the magazine, what ammo have is giving you the issue, and have you tried any others?

  8. #8
    x10
    x10 is offline
    Master x10's Avatar

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    When it does that check the top round in the mag and see if there are scratches on the case start in mid case. That would indicate that the bolt was not making back far enough to pick up the round then that is leading you to the gas system
    I can't figure out if you an Ugly Woman or a Pretty Monster

  9. #9
    Expert NyleRN's Avatar

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    A simple check to see if it's short stroking is to load 1 round and keep the empty mag in the gun. Fire it off. If the bolt locks back then you have enough gas

  10. #10
    Grandmaster halfmileharry's Avatar

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    Quote Originally Posted by NyleRN View Post
    A simple check to see if it's short stroking is to load 1 round and keep the empty mag in the gun. Fire it off. If the bolt locks back then you have enough gas
    This would be my route to go with. What ammo did you say?
    The more you sweat in training the less you bleed in battle.

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