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Thread: Upper and lower mating tolerances

  1. #21
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    Quote Originally Posted by markm View Post
    Can you get a pic of the buffer retaining area from above and to the side of the lower with the upper removed... or at least with the receivers opened up???

    (the back of the bolt carrier should be flush with the back of the upper receiver. The Buffer face should stick forward a little. Then the back of the Carrier (when closing the receivers) should push the buffer back to that it's not touching the buffer retainer when the actions are closed.

    If the back of the carrier is hitting the TOP of the buffer at all when you close the receivers, there are problems. It should only contact the face/front of the buffer... nowhere else.
    Yea I will post some up in a sec

  2. #22
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    this is as far as it goes without having to use a a hulk grip to seat them together at which point they "snap" together.


  3. #23
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    Those are filtered at my work... maybe some of the other guys can offer an opinion. I'll look at them from home in a few hours.
    "You people have too much time on your hands." - scottryan

  4. #24
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    Looks like a non issue to me but I prefer mine to have a snug fit.

    Are you having issues when shooting?

  5. #25
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    Quote Originally Posted by wahoo95 View Post
    Looks like a non issue to me but I prefer mine to have a snug fit.

    Are you having issues when shooting?
    Function test shows it to be good. I won't get a chance to fire it until next Saturday. (and yes before someone says it, rear sight is on backwards, i just threw it on and locked it with my finger to keep it together till i get ahold of my appropriate size flathead)
    Last edited by WaterChunker; 07-31-14 at 15:15.

  6. #26
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    Get out and shoot it and it all functions well enjoy your new build. All looks fine from me from the pics. Also don't sweat the snug fit since its not like you'd need to do a speedy break down to change a trigger pack in the middle of a firefight. I have one rifle that has a very snug fit and I simply push in on the pin enough to expose enough of the other side to lift with the rim from a cartridge. Easy peasy.
    Last edited by wahoo95; 07-31-14 at 15:36.

  7. #27
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    No. Tight pins are one thing. If the receivers WON'T shut smoothly, there's something wrong. If the RE isn't in the right spot or the Buffer detent isn't positioned properly, there can be damage to the components of the gun.

    It could also be the upper receiver's rear lug that is too wide for the inside of the lower. I'll look at the pics, and then take a pic of the buffer engagement when I get home in a while.
    "You people have too much time on your hands." - scottryan

  8. #28
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    Another thought on this....

    When you close your receivers. Are you leaving the hammer cocked? Depending on a TYPE 1 or TYPE 2 hammer... If you leave the hammer down, the firing pin can float back and hit the decocked hammer and cause hang up.

    You need to either close the action on a cocked hammer, or point the muzzle down so the firing pin floats forward.
    Last edited by markm; 07-31-14 at 15:55.
    "You people have too much time on your hands." - scottryan

  9. #29
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    Dumb question.... Have you tried closing it without the BCG, buffer and of course spring out of the gun??

  10. #30
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    Excellent suggestion.
    "You people have too much time on your hands." - scottryan

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