PDA

View Full Version : Bad upper lower fit


unkownindividual
01-25-2010, 8:50 PM
I have a new build that i'm almost done with and when i finally mated the upper and lower together there was a noticeable amount of wobble. when i had put upper and lower together dry, w/o pins it seemed very nice and tight. i even put an acuwedge and it made little difference. so i swapped the upper with another rifles lower and it was solid. so i know it's not the upper. Could it be the takedown pin is bad? any help would be very appreciated. BTW the lower is a POF gen 3 NP3 and the upper is a Sabre defence forged upper. The lower parts kit kit is White Oak. Thanks in advance....

Noobert
01-25-2010, 8:51 PM
does the pin appear to be undersized for your lower receiver?

unkownindividual
01-25-2010, 8:55 PM
it seems proper, it doesent wobble from side to side when in the lower and not mated to the upper.

unkownindividual
01-25-2010, 9:05 PM
http://i876.photobucket.com/albums/ab328/unkownindividual/CIMG0149.jpg

unkownindividual
01-25-2010, 9:06 PM
http://i876.photobucket.com/albums/ab328/unkownindividual/CIMG0150.jpg

unkownindividual
01-25-2010, 9:06 PM
http://i876.photobucket.com/albums/ab328/unkownindividual/CIMG0147.jpg

unkownindividual
01-25-2010, 9:07 PM
http://i876.photobucket.com/albums/ab328/unkownindividual/CIMG0147.jpg

Barney Gumble
01-25-2010, 9:54 PM
It's completely normal to have some play, and if it weren't that way it would make interchangeability of uppers and lowers more difficult. Whether it has a little wobble or not has no impact on accuracy, so don't worry about it. The only thing it affects in a negative way is the stress level of people who have OCD tendencies. ;)

Seesm
01-25-2010, 10:21 PM
I think your ok... I have 1 that is loose and one that is tight and one that is JUST RIGHT... But they all swap and that is important to me...

Kerplow
01-25-2010, 10:53 PM
i was told to nit pick my upper when purchasing and make sure it fits snugly with the lower.

i dont know whether or not it makes a difference in accuracy, but i would certainly rather have a nice fitting gun to a weeble-wobble.

NiteQwill
01-25-2010, 10:56 PM
Oh god, the "wobble" scare. :rolleyes:

AR rifles are supposed to "wobble." Any attempted "fixing" with an accuwedge or tape or whatever will only make it worse.

Randall and myself addressed the issue a few weeks ago. Wobble does not affect accuracy, and neither does a "snug" fit.

Barney Gumble
01-25-2010, 11:16 PM
i was told to nit pick my upper when purchasing and make sure it fits snugly with the lower.

Again...whether it wobbles or not has nothing to do with anything. The advice you got is complete BS.

This is very much along the lines of people worrying about getting brass marks on their shell deflector.

PaperPuncher
01-26-2010, 7:18 AM
Oh god, the "wobble" scare. :rolleyes:

AR rifles are supposed to "wobble." Any attempted "fixing" with an accuwedge or tape or whatever will only make it worse.

Randall and myself addressed the issue a few weeks ago. Wobble does not affect accuracy, and neither does a "snug" fit.

Agree.

I'll start with: I am totally OCD with my rifles. I'm working on it though, lol. I even have a dirty gun in my safe right now. Relax, it's a high point.

I put an accu wedge in the first AR I ever had. It was used and had some wobble (one having nothing to do with the other). I read all over that this was common but for some reason I still didn't like it. Well, I picked up an accu wedge to solve the issue. Within 4 shots my upper locked up with the BCG inside the buffer tube. The Accu wedge put enough pressure on the upper to cause misalignment of the carrier travel. Scraped up my buffer tube pretty bad but no permanent damage thank god. Took it out and never looked back. Wobble was better than non-functioning.

missiontrails
01-26-2010, 7:50 AM
#1 Throw your Accuwedge in a dumpster.
#2 Buy this and install first: http://www.armalite.com/ItemForm.aspx?item=ENM001&Category=93c41860-4ca2-43ee-8ca9-dc09b1a5bf2c

#3 If #2 did not take out enough slop to your liking, buy and install this: http://www.armalite.com/ItemForm.aspx?item=ENM002&Category=93c41860-4ca2-43ee-8ca9-dc09b1a5bf2c

These pins cure wobble issues, but the pins are harder to push in and out. If the pivot pin does the job (some people go ghetto with a rubber o-ring instead up there), then you can just leave your standard takedown pin in there. If you replace your takedown pin with one of these, you will need to lightly "tap" it out to open your receivers.