Side to side play Between Upper and lower

First off I am pretty new to the AR platform so for my first gun I bought a DDM4 instead of trying to build my own. I didn't notice it at first but after shooting it a few times I noticed some slight side to side play between the upper and lower. I lurked around and saw others that have had this problem as well. It seems like most people just suggest to embrace it and not to worry as it won't really effect anything seriously. Others have suggested to use an accuwedge. I'm pretty nit picky on how any type of gun feels in my hands so I was probably going to give the accuwedge a try. Just wanted to see what some of you more experienced shooters opinions were on the accuwedge.

It's just the nature of the beast. If she shoots good I'd just learn to ignore it. Upper to lower fit varies quite a bit from one to the next. The accuwedge thing won't hurt anything but will probably do more for vertical movement than the side to side play you are describing.

What Ray said.
He's actually quite coherent when he is not binging on Cheetos.

And, I didn't even mention anything about the guys mild case of OCD.

(I'd put a smiley here but don't know how on my phone)

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Originally Posted by ray1970

And, I didn't even mention anything about the guys mild case of OCD.

(I'd put a smiley here but don't know how on my phone)

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It's not OCD when it's a concern about my precious baby. :P

the acceptable limit (per the Army's M4 specs) is something like .02, but I can't remember if it's in inches or mm...... the armorers have a little gap gauge to tell whether or not its in spec...

in any case, a little wiggle won't hurt accuracy or durability...

if you still want to get a snug upper/lower fit you may try these:

http://www.triggershims.com/ar_15_shims.html


AR-15 Pivot Pin / Take-Down Pin Shimshttp://www.triggershims.com/sitebuil..._pin_shims.jpg
You can use these shims to take out the play between the Upper and Lower Receiver.

Our AR-15 Shims are made by us here in the USA out of American Made Materials.
Fits Standard 1/4" Pivot Pins / Take-Down Pins
Available in 300 Series Stainless Steel.

Six Pak kits come Standard in .005" SS
12 Pak Assortment has 4 X .002", 4 X .003" and 4 X .005" SS
24 Pak kits come Standard in .005" SS
and in a 24 Assortment Pak which has
8 X .005", 8 X .003", 8 X .002" Shims

Item # AR15-PSP6 Pivot Pin Shim 6 Pak $10.00 Free Shipping
Item # AR15-PSP12A Assortment Shim 12 Pak $17.00 Free Shipping
Item # AR15-PSP24 Pivot Pin Shim 24 Pak $22.00 Free Shipping
Item # AR15-PSP24A Assortment Shim 24 Pak $22.00 Free Shipping

Seems like a lot of work for something that isnt even a problem.






If it ain't broke...

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Originally Posted by Goodburbon

Seems like a lot of work for something that isnt even a problem.

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$10 and 5 minutes to install 2 shims for a rock solid no receivers play rifle?

Thanks for the replys everyone! Think I'm just gonna live with the slight play and tell my brain to not worry about it.

If it bugs you get the Accuwedge. It's a low cost fix and a blind retarded monkey could install it. I use the Accuwedge on two of my aluminum lower builds and it eliminates all play. My NFA polymer lower build is a tight fit and does not require the device. Barnes Precision Machine incorporates an adjustment screw in their lowers to eliminate excess play, so you might want to look into those as well.

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Don't listen to the noobs.... Your AR is doing Harlem Shake!