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 Post subject: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 3:06 am 

Joined: Sun Oct 03, 2010 10:43 pm
Posts: 12
Location: L.A. / Orange County California
Is it normal for the 556 to have a certain amount of play between the upper and lower?

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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 9:27 am 
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Joined: Thu May 27, 2010 1:10 pm
Posts: 196
Location: Omaha, NE
I have 5 - 556s (pistols, rifles, DMR) and every one "rattles". It doesn't seem to be a problem because the play is between the lower/upper, whereas the barrel and upper are one unit and are quite solid. From what I've read is pretty common. An earlier thread here discussed sending a rifle back to Sig, where they tightened it up somehow. Not clear exactly how, but it's an option if you think it's really a problem.


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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 10:03 am 
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Joined: Sat Sep 04, 2010 3:01 pm
Posts: 680
Location: AZWS
gstaylorg wrote:
I have 5 - 556s (pistols, rifles, DMR) and every one "rattles". It doesn't seem to be a problem because the play is between the lower/upper, whereas the barrel and upper are one unit and are quite solid. From what I've read is pretty common. An earlier thread here discussed sending a rifle back to Sig, where they tightened it up somehow. Not clear exactly how, but it's an option if you think it's really a problem.

5 huh? Do they ever get jealous of each other. :wink:


As for the play, yes, as mentioned, it's normal to have a little play, though some have none. AR's are the same.

As for SIG in that thread, for some reason I don't think they did anything to tighten up that rifle, I remember the thread but don't remember how it was titled. I think SIG just swapped out his lower for a tighter fitting one and sent it back.

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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 10:32 am 
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Joined: Thu Aug 27, 2009 11:05 am
Posts: 472
Location: Sno Co, Washington
Solve the rattle...
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Small peice of duct/gorilla tape right there. It completely gets rid of the rattle. You will have to replace it. I have had to replace mine twice this year, just depends on how often you disassemble your rifle. It's gonna be a tight sqeeze at first, but give it a couple of palm whacks and it will fit. :lol:

good luck,
Geardo

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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 11:11 am 

Joined: Sun Oct 03, 2010 10:43 pm
Posts: 12
Location: L.A. / Orange County California
Thanks for the input, if it is normal to have a little bit of play then that's fine to me, it's just that I'm use to pistols that have tight fittings and bolt action rifles/shotguns that doesn't have upper and lower like the Black rifles.

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DPMS LR308
STAG ARMS 5.56 AR15 UPPER PLUMCRAZY LOWER


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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 1:53 pm 
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Joined: Thu May 27, 2010 1:10 pm
Posts: 196
Location: Omaha, NE
Geardo,

I've thought about something similar, except with the idea of "re-useable" in mind. My idea was to try a very thin plastic washer with a hole large enough not to be a pain in the ass for centering to get the front takedown pin back in. I've seen a number of very small washers (~1/8" i.d. or so) of the type I'm thinking about...the plastic is very thin and pliable, not stiff. Haven't gotten around to actually looking for a larger one yet. From your experience with the tape, do you think this approach would work...or waste of time?


BTW: Nah...they don't get jealous Reno, my two P239s keep the 556s in line (LOL)


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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 2:49 pm 

Joined: Sun Oct 03, 2010 10:43 pm
Posts: 12
Location: L.A. / Orange County California
By the way, I did not mention on my original post that I was using the Quick take down pin from KNS, which I noticed that it has more slop than with the original pin so I measured the KNS O.D. and it measured 7.82mm while the original take down pin is 7.88mm, that means 0.06mm difference does contributes to even more slop between the upper and lower, but if it does affect performance then I'll leave it alone but I;ll try a very thin piece of lexan to shim the hinge area which might work.

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Dan Wesson PM 7 .45
Remington 870
Browning Classic Shotgun
Springfield Loaded 9mm 1911
Remington 700 .308 SPS Tactical w/ AXIOM stock
Ruger SR9c
CZ75 COMPACT .40 S&W
WASR 10/63
DPMS LR308
STAG ARMS 5.56 AR15 UPPER PLUMCRAZY LOWER


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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 7:24 pm 
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Joined: Thu Aug 27, 2009 11:05 am
Posts: 472
Location: Sno Co, Washington
There is, or was a tread covering a "o-ring" for around the front take down pin. Proper mesurements and stuff. Can't seem to find it.

I have the KNS take down pin and the tape works just fine.

There is no problem with a little rattle between the upper and lower. I just dont like it.

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Missing my 556
"Good tactics can save even the worst strategy. Bad tactics will destroy even the best strategy." -GENERAL GEORGE S. PATTON, JR.


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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 10:09 pm 

Joined: Mon Mar 22, 2010 9:50 pm
Posts: 188
Location: Long Island
Mine had a little play but I tightened it up. There is a screw on the hinge where the rifle "breaks" in half. Tighten it up.


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 Post subject: Re: Upper and Lower fit
PostPosted: Mon Oct 18, 2010 11:28 pm 

Joined: Sat Feb 16, 2008 3:44 pm
Posts: 117
Play between the upper and lower is normal and is to be expected. If you're anal about it (and there is no reason to be), you can reduce it with aftermarket junk, an O-ring, or tape. If you're really anal, you can simply weld the upper and lower receiver together. This would solve the problem all together.


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 Post subject: Re: Upper and Lower fit
PostPosted: Tue Oct 19, 2010 12:01 am 
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Joined: Sun Feb 28, 2010 8:50 pm
Posts: 19
Location: USA
I have always heard that is to be expected. I only have one and it does not.

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 Post subject: Re: Upper and Lower fit
PostPosted: Tue Oct 19, 2010 8:26 am 

Joined: Tue Mar 03, 2009 11:31 pm
Posts: 427
Location: New Hampshire
WayaX wrote:
If you're really anal, you can simply weld the upper and lower receiver together. This would solve the problem all together.


:lol: :lol: :lol: :lol: :lol: :lol: :lol:


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 Post subject: Re: Upper and Lower fit
PostPosted: Fri Oct 22, 2010 7:08 pm 

Joined: Tue Oct 05, 2010 8:28 pm
Posts: 2
ive got a decent amount of play in mine as well......i have the kns pin too.....


Where/how would you apply the o-ring ? anyone make some type of Accu wedge like the AR's ?


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