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Ar15 bolt going home when you bump stock

Discussion in 'AR Pattern Rifles' started by Zbizzle911, Nov 3, 2019.

  1. Zbizzle911

    Zbizzle911 Charter Freedom Lover Charter Member Supporting Member

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    My brother assembled an ar15 from aero parts. Everything looks fine but when the bolt is locked to the rear and you barley bump the stock it send the bolt home. None of mine do that. Any advice on what to check? He’s an newb and I wasn’t there when he put it together.


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  2. SDIVER2006

    SDIVER2006 SDIVER2006

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    Mines did that I had a bolt catch thingie that was a Cnt hair outta spec
     
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  3. Burt Gummer

    Burt Gummer Nuts Over Lil D. Staff Member Benefactor Charter Life Member Supporting Member

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    Have to see it. Bolt catch is only thing that holds it back. May be outta spec like above, might be the little piece missing behind the spring not keeping tension. I’d like to know what you find out. Where’s your BIL at?
     
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  4. Zbizzle911

    Zbizzle911 Charter Freedom Lover Charter Member Supporting Member

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    He's in Midway too. I told him to buy a new Bolt catch bc thats all I could think of too. Ill make sure he gets one and i'll let y'all know.
     
  5. Catfish

    Catfish E Pluribus Mendacium Charter Member

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    Inspect the bolt catch, make sure the spring is installed and proper, and make sure it can move freely.
     
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  6. Zbizzle911

    Zbizzle911 Charter Freedom Lover Charter Member Supporting Member

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    I actually took it out and reinstalled it, it functioned fine. I wonder if he put the wrong spring in it? Thats the one thing I didn't check very close.
     
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  7. jmccracken1214

    jmccracken1214 I didn’t learn the first time Supporting Member

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    Weak bolt catch spring.
    Parts are cheap, replace it all to be safe. The weak spring isn’t allowing the catch to go up as high as it should.
     
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  8. Zbizzle911

    Zbizzle911 Charter Freedom Lover Charter Member Supporting Member

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    adjustable
     
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  9. rdinatal

    rdinatal Better late then never...

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    To all that are saying it's a weak bolt catch spring... Think about what the spring does. o_O
    Where is the bolt catch normally?
     
    Last edited: Nov 3, 2019
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  10. kcult

    kcult Alcohol fueled dumbass Charter Member Supporting Member

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    Perhaps the catch is binding on the roll pin. If the holes weren't aligned and the roll pin hit the edge of the hole in the catch, displaced metal would rub against the pin.
     
  11. rdinatal

    rdinatal Better late then never...

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    On mine when...
    Empty mag in, BCG open, butt strike, BCG stays open.
    BCG locked open, no mag, butt stike, it depends if the strike is hard enough to cause the BCG to shift rearward enabling the catch to retract by the spring force.

    It really doesn't take a lot of force to move the BCG slightly rearward to let the mag catch spring drop the catch.

    Maybe the catch isn't up as far as it should. @kcult @Me. might be on it. Is the catch easy moved to the extreme up position?
     
    Last edited: Nov 3, 2019
  12. Charlie

    Charlie Member

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    I had a factory gun with a bad bolt catch that had to be replaced to get it to work properly. The spring was too strong or the catch was out of spec, I forget which. I replaced the spring and catch and have not had a problem since. If you have another AR 15 that works properly, temporarily swap out the parts with the bad ones to see what is causing the problem.
     
  13. NKD

    NKD Senior Member Benefactor Kimberless Supporting Member

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    Had this problem. Replaced with Seekins.
    Works great now.
     
  14. Charlie

    Charlie Member

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    Get an empty magazine, take the upper off the lower, insert the empty magazine, and observe how the catch works. The bolt catch barely moved on the one I have that did not work properly.
     
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  15. charliedeltajuliet

    charliedeltajuliet Redneck Hillbilly Widget Ninja Sponsor

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    I bought a San Tan Tactical set that would do this. It was due to the milling at the takedown pins. The “slop” would allow it to release the BCG. They happily replaced it when they seen what it did. You could twist the upper and lower and it would do it occasional too.
     
  16. SDIVER2006

    SDIVER2006 SDIVER2006

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  17. 11B CIB

    11B CIB Administrator Staff Member Charter Life Member

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    If it’s releasing with only a tiny tap that’s not normal. But I haven’t handled an M4 or M16 I can’t slam my hand against the stock to get the bolt to close if it’s locked back.
     
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  18. Ikarus1

    Ikarus1 Avtomat Krishna-kov

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    my buddy in WRC said that's how they TRAIN them to release the bolt on their patrol rifles
     
  19. Scrubber3

    Scrubber3 Active Member

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    What magazines is you're BIL using?