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Thread: This is why you don't buy DPMS crap. (PIC)

  1. #21
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    He already tried a Colt LPK as well and had the same issue. I am pretty sure that it's the holes.

    Quote Originally Posted by rsilvers View Post
    If it were me I would measure the pin holes and see if they were out of spec. Or else it could be the pins. It may not change what you do, but then at least the cause is known.



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  2. #22
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    Quote Originally Posted by Iraqgunz View Post
    He already tried a Colt LPK as well and had the same issue. I am pretty sure that it's the holes.
    ===================================

    IG, just wondering...

    Since he's got $$ tied up in the Lower, how practical would it be to ream the holes out to the larger Colt size and put in a new FCG?

    .

  3. #23
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    I suppose it could be done. As much as I dislike KNS pins, this is a scenario where they would prove useful.

    Quote Originally Posted by ucrt View Post
    ===================================

    IG, just wondering...

    Since he's got $$ tied up in the Lower, how practical would it be to ream the holes out to the larger Colt size and put in a new FCG?

    .



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  4. #24
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    Quote Originally Posted by ucrt View Post
    ===================================

    IG, just wondering...

    Since he's got $$ tied up in the Lower, how practical would it be to ream the holes out to the larger Colt size and put in a new FCG?
    Hello,

    I actually happen to be a machinist and what your proposing can be done, but it would be much better done with an end mill on a milling machine and not a reamer alone - because the reamer will follow the side of the hole that has the least resistance.

    1911-A1 would need to provide a print for the machinist doing the work though, so he could locate the holes from a set of known parameters just in case the holes are slightly off print (not the holes being out of spec in diameter, but rather to insure that the enlarged holes are machined exactly where their suppose to be) and he would want to have his new pins in hand so the holes could be sized to them. In other words - mic the new pins and don't just machine some .170" Dia holes in the lower while your waiting on the new pins to arrive.
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  5. #25
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    Quote Originally Posted by Bob Reed View Post
    Hello,

    I actually happen to be a machinist and what your proposing can be done, but it would be much better done with an end mill on a milling machine and not a reamer alone - because the reamer will follow the side of the hole that has the least resistance.

    1911-A1 would need to provide a print for the machinist doing the work though, so he could locate the holes from a set of known parameters just in case the holes are slightly off print (not the holes being out of spec in diameter, but rather to insure that the enlarged holes are machined exactly where their suppose to be) and he would want to have his new pins in hand so the holes could be sized to them. In other words - mic the new pins and don't just machine some .170" Dia holes in the lower while your waiting on the new pins to arrive.
    Wow, this is the reason I like coming here. Over on arfcom, this thread would have been a fanboy slapfight.

    Thanks for the good info. I'll probably just opt for the KNS pins. They serve a purpose, and are a simple fix. I don't want to spend any more time on this piece of shit than I already have.

  6. #26
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    Keep in mind, if your pin holes are oversized, the KNS pins will still shift around in the hole.

    If worn, the holes are likely out of round
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  7. #27
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    Quote Originally Posted by Eric View Post
    Not to insult you at all, but can you confirm the hammer spring is configured like this photo. Note the legs of the spring come from the underside and rest on the top of the trigger pin.

    A reversed hammer spring is the most common cause of the trigger pin walking out.
    This...and the J-spring will hold the pins even when the holes are somewhat oversize.

  8. #28
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    Never mind - read whole thread before responding.
    Last edited by Renegade; 06-04-11 at 22:14.

  9. #29
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    Quote Originally Posted by Renegade View Post
    He could overbore the holes to Colt Large Pin Specs, and then use a Colt FCG.
    That sounds like a plan to me!
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  10. #30
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    Quote Originally Posted by mike_556 View Post
    John Holliger of White Oak has long said he will not work on dpms garbage.
    Same goes for their LPKs?

    Quote Originally Posted by Iraqgunz View Post
    I suppose it could be done. As much as I dislike KNS pins, this is a scenario where they would prove useful.
    Dislike because they are (largely) unnecessary and are (again largely) just another accessory, or is there another problem with them?

    Quote Originally Posted by MistWolf View Post
    Keep in mind, if your pin holes are oversized, the KNS pins will still shift around in the hole.

    If worn, the holes are likely out of round
    Would this cause a problem if they were 'rattling around' in the pin holes or are we most worried about them completely walking out?
    Last edited by hunt_ak; 06-05-11 at 09:03.

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