Pennsylvania Firearm Owners Association
Results 1 to 5 of 5
  1. #1
    Join Date
    Apr 2009
    Location
    Philadelphia, Pennsylvania
    (Philadelphia County)
    Posts
    389
    Rep Power
    999

    Default AR15 takedown pin is LOOSE

    I helped a buddy throw a lower together the other night and after building it up and mating upper to lower, I notice how loose the rear takedown pin was.

    It would literally slide right out if held ejection port down.
    I've never seen this before.

    Is it possible the takedown pin itself was machine a fraction too small?

    A new pin, detent and spring are on the way, but the detent and spring seem to be doing their job of retaining the pin itself (so it doesn't slide out) it is just loose as a goose, so to speak.

    Any ideas?

  2. #2
    Join Date
    Oct 2006
    Location
    Around, Pennsylvania
    (York County)
    Posts
    1,655
    Rep Power
    205

    Default Re: AR15 takedown pin is LOOSE

    Quote Originally Posted by he11zna View Post
    I helped a buddy throw a lower together the other night and after building it up and mating upper to lower, I notice how loose the rear takedown pin was.

    It would literally slide right out if held ejection port down.
    I've never seen this before.

    Is it possible the takedown pin itself was machine a fraction too small?

    A new pin, detent and spring are on the way, but the detent and spring seem to be doing their job of retaining the pin itself (so it doesn't slide out) it is just loose as a goose, so to speak.

    Any ideas?
    It is a possibility the pin is small...or, the hole for the pin may be a bit large. Since you have a new pin ordered, you'll know soon enough what the problem is.
    If the hole is big, you may have to contact the receiver manufacturer. They'll probably replace the receiver, but if you bought it stripped, it'll have to go back stripped. I don't think bushing the hole would work due to the relative thiness of the receiver walls.
    So, I hope your new pin rectifies the problem.
    No, I've never seen a loose pin either. I have seen uppers and lowers with more slop then I'd like, but the rifles shot fine.
    Well, pushed 60 too hard so now I am the big SIX-OH. Now I can be a real pain in the ass! And, who says growin' old isn't fun!!

  3. #3
    Join Date
    Jan 2008
    Location
    noneville, Massachusetts
    Posts
    3,368
    Rep Power
    8948

    Default Re: AR15 takedown pin is LOOSE

    Could be the upper too. This is what forces some guys to peen their take down lug slightly to create a tighter fit. Usually only an issue on cheaper/budget rifles.

    What brand is the upper receiver?

  4. #4
    Join Date
    Sep 2008
    Location
    Near Indiana, Pennsylvania
    (Indiana County)
    Posts
    6,181
    Rep Power
    21474858

    Default Re: AR15 takedown pin is LOOSE

    The pin should measure .250"

    If everything measures out OK, you will have to determine what is out of spec, the upper or lower.

    If all else fails, install an accuwedge, this is the only time IMO that they should be used.

  5. #5
    Join Date
    Mar 2006
    Location
    NE Philadelphia, Pennsylvania
    (Philadelphia County)
    Posts
    221
    Rep Power
    336455

    Default Re: AR15 takedown pin is LOOSE

    +1 on the accuwedge. Those things make it nearly impossible to move the pin with the use of a tool.
    AR accessories - Barbie for men

Similar Threads

  1. Sig 556 Rear Takedown pin
    By klausag in forum General
    Replies: 3
    Last Post: July 2nd, 2009, 12:35 PM
  2. Replies: 8
    Last Post: June 14th, 2009, 08:21 PM
  3. 1911 takedown tool question
    By Jailkeeper in forum General
    Replies: 10
    Last Post: April 7th, 2009, 09:35 AM
  4. AR-15 Takedown Pin---HELP PLEASE!
    By zmaro in forum General
    Replies: 2
    Last Post: February 23rd, 2008, 08:10 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •