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Posted: 4/29/2011 3:23:24 PM EDT
i have a ddm4 upper mounted on a stag lower, i find a little play between the upper and lower, how do i fix that?
i bought a accu wedge a while ago just in case, will that help?
Link Posted: 4/29/2011 3:36:30 PM EDT
Isn't it normal to have some play?
Link Posted: 4/29/2011 3:38:43 PM EDT



Originally Posted By skcusloa:


Isn't it normal to have some play?


Yep, not a problem.

 
Link Posted: 4/29/2011 4:30:01 PM EDT
Normal, tolerances.
Link Posted: 4/29/2011 4:52:34 PM EDT
Originally Posted By comp1911:
Normal, tolerances.


ok...i leave it alone...thanks


will it affect the accuracy?
Link Posted: 4/29/2011 4:53:53 PM EDT
Won't effect accuracy
Link Posted: 4/29/2011 5:05:53 PM EDT
Originally Posted By DEERHEAD:
Originally Posted By comp1911:
Normal, tolerances.


ok...i leave it alone...thanks


will it affect the accuracy?


nope
Link Posted: 4/29/2011 5:40:02 PM EDT



Originally Posted By DEERHEAD:


i have a ddm4 upper mounted on a stag lower, i find a little play between the upper and lower, how do i fix that?

i bought a accu wedge a while ago just in case, will that help?


Yes, that is what the accu wedge is for

 
Link Posted: 4/29/2011 5:44:09 PM EDT
Some people use an accuwedge to tighten up the fit.  I wouldn't bother; as posted above, it's completely normal.
Link Posted: 4/29/2011 8:35:09 PM EDT
i like my receiver wiggle.

almost as much as i like my sproing
Link Posted: 4/30/2011 11:45:55 PM EDT
The accuwedge is a neat piece of pretty much useless feel good crap that made the inventor a bunch of money. I bought one too when I first started shooting AR's but they are totally un-needed. USGI spec for play is .020. If you can slide a .020 feeler gauge between the ears of the receiver and the lug of the upper it is considered too loose. I doubt you will find many factory built AR's that loose and if you did I'd consider replacing the upper rather than spending money on gizmos.
Link Posted: 5/1/2011 6:45:41 AM EDT
Its normal,Dont wedge it..waist of money,wont affect accuracy.Its a service weapon a little play is good.Easy to strip with no tools is a good thing.
Link Posted: 5/1/2011 6:50:02 AM EDT
Originally Posted By DEERHEAD:
Originally Posted By comp1911:
Normal, tolerances.


ok...i leave it alone...thanks


will it affect the accuracy?


No, your barrel and sights are all attached to the upper.
As long as the barrel is properly installed and your sights are tight accuracy will not be affected.
All the lower does is hold the fire control where it can fire the round in the chamber.
Link Posted: 5/1/2011 9:25:05 AM EDT
Originally Posted By comp1911:
Originally Posted By DEERHEAD:
Originally Posted By comp1911:
Normal, tolerances.


ok...i leave it alone...thanks


will it affect the accuracy?


nope


I have a Daewoo K-2 and it had some wiggle I put a 0-ring that some one here suggested and my groups tightened up a lot and that's with the same ammo I have been shooting
Link Posted: 5/1/2011 10:06:22 AM EDT
Originally Posted By tx318:
Originally Posted By comp1911:
Originally Posted By DEERHEAD:
Originally Posted By comp1911:
Normal, tolerances.


ok...i leave it alone...thanks


will it affect the accuracy?


nope


I have a Daewoo K-2 and it had some wiggle I put a 0-ring that some one here suggested and my groups tightened up a lot and that's with the same ammo I have been shooting


I believe were talking about AR-15's here.
I have about the same wiggle in my old Colt SP1 as my BCM middie no gizmoes in either.

Link Posted: 5/1/2011 11:56:38 AM EDT
will it cause lower crack under heavy fire?
Link Posted: 5/1/2011 12:45:04 PM EDT
[Last Edit: 5/1/2011 12:46:05 PM EDT by warpig8654]
Slop between the upper & lower affects nothing. There's nothing more to it. I thought that this has been made abundantly clear?
Link Posted: 5/1/2011 2:46:44 PM EDT
Originally Posted By DEERHEAD:
will it cause lower crack under heavy fire?


No.   The same loose fit on 458 Socom or Beowolf uppers doesn't cause cracking, and they recoil much more than 556.
Link Posted: 5/1/2011 2:52:43 PM EDT
Originally Posted By SchlaffTablett:
The accuwedge is a neat piece of pretty much useless feel good crap that made the inventor a bunch of money. I bought one too when I first started shooting AR's but they are totally un-needed. USGI spec for play is .020. If you can slide a .020 feeler gauge between the ears of the receiver and the lug of the upper it is considered too loose. I doubt you will find many factory built AR's that loose and if you did I'd consider replacing the upper rather than spending money on gizmos.


I wouldn't call it useless but it isn't something that is needed. If the wiggle bothers someone it is a cheap fix(as is the o ring trick). A bunch of lowers now have set screws to help with this as well.

OP it is normal and yes an accuwedge should help. The wiggle doesn't effect accuracy.
Link Posted: 5/1/2011 3:07:49 PM EDT
It bothers me so I got a little black rubber O-ring 1/2" ID and smaller than 3/32 thickness and it seems to do the trick.  3/32 is just large enough that when it flattens out it will disrupt mags from dropping free.
Link Posted: 5/1/2011 3:42:58 PM EDT
I think for most applications, the wiggle between the upper and lower is inconsequential for accuracy.  However, if you are doing precision shooting with your AR and holding your rifle on a bench the via traditional method i.e. right hand on the grip and around the trigger and left hand under the right arm with your left hand gripping the end of the stock, you are going to lose some accuracy.  This is because if you are trying to steady the gun using your left hand on the stock and the stock wiggles, then you can see why it may be more difficult controlling your barrel and thus accuracy.
Link Posted: 5/1/2011 4:29:52 PM EDT
[Last Edit: 5/1/2011 4:29:52 PM EDT by Lancelot]
dupe
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