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

  1. #31
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    Quote Originally Posted by hunt_ak View Post
    Dislike because they are (largely) unnecessary and are (again largely) just another accessory, or is there another problem with them?
    Can't speak for the person who listed it but yea a lot of people don't like them because they see them as unnecessary and just an accessory that generally has no use. Don't really know of other problems with them personally. Anyway I know a few people that have used them over the years to fix the issue with pins walking. I'd give it a try before I had a machinist either open up the holes(I agree with not using a reamer from whoever said he was a machinist).

    I've seen people use steel bushings after opening the holes to install them as well. I've only seen this done on registered full auto receivers though. It could be done on a normal lower but I'm assuming that the cost would make it more reasonable to just replace the lower.

    I'd try the kns pins or something like them. I've seen a few extended pins with c clips on the end to prevent walking from the receiver(these have been around a while). I've also seen them with screws on the end. I'd go with the kns pins myself.

  2. #32
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    What about oversize .155 pins? I think kns makes them also.

  3. #33
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    .155 is not oversized. That is the correct size for milspec type lowers.

    Quote Originally Posted by Elessar View Post
    What about oversize .155 pins? I think kns makes them also.



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  4. #34
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    They are marketed to people with the belief that it prevents something that no one has proven (actually happens). In any case I don't want to use a crutch to fix something.

    Quote Originally Posted by hunt_ak View Post
    Same goes for their LPKs?


    Dislike because they are (largely) unnecessary and are (again largely) just another accessory, or is there another problem with them?

    Would this cause a problem if they were 'rattling around' in the pin holes or are we most worried about them completely walking out?



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  5. #35
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    Quote Originally Posted by Iraqgunz View Post
    They are marketed to people with the belief that it prevents something that no one has proven (actually happens). In any case I don't want to use a crutch to fix something.
    Yeah, I still can't believe people buy Accu-Wedges...let alone KNS pins. I think I'm going to invent something that closes the ejection port cover while loading in the cycle of operations to prevent dirt and grime from getting into the action...
    Why do the loudest do the least?

  6. #36
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    If you ream or open up the holes, wouldn't you then need to re-anodize? Its my understanding that the anodizing provides hardness. If left un-anodized it would be susceptible to opening up again, is this correct?

  7. #37
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    Try a drop in trigger group. This will eliminate the problem completely.

    I have a lower I machined from an 80%er and had to enlarge the holes for Colt .172 pins. Easy to do with a drill press but it took awhile to find Colt FCG parts. More available now than back then. I used a .170 drill bit and the runout on my press made perfect .172 holes.

  8. #38
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    OP still hasn't answered if the hammer spring is installed correctly. I don't see how he could have this problem if it were...
    never push a wrench...

  9. #39
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    He stated as much in his initial post. I honestly haven't dealt with many "walking" pins for the fact that I don't deal with crappy lowers for the most part.

    If everything is installed correctly then those holes must be really ate up if something is still walking. I'd personally like to see a detailed pic of the lower. I also wonder if it is only the trigger pin or both.

    Quote Originally Posted by ra2bach View Post
    OP still hasn't answered if the hammer spring is installed correctly. I don't see how he could have this problem if it were...



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  10. #40
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    Hm..so how can the holes being a little oversize cause this problem?? I can see the ends of the pins rotate in a lot of my AR's (probably all, just haven't checked them all) and they never back out. I just checked 2 Noveske's and the trigger pin on both rotate as I press the trigger. The pins aren't supposed to be a tight fit in the holes. Are the grooves for the hammer spring in the trigger pin correct? Trigger screwed up so the hammer spring legs can't drop into the grooves in the trigger pin?
    Last edited by bmg; 06-05-11 at 22:22.

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