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Per the TM when you conduct an inspection of the weapon you are supposed to use a .020 inch feeler gage and do the following;
I personally don't worry much about the wiggle as it has no impact on accuracy. Putting a new upper receiver in place may or may not totally solve the issue. I am not a big fan of Accu-wedges as I have seen them cause issues. I am also not a big fan of making a permanent alteration like bedding.
1. With the upper receiver attached to the lower receiver, and the pivot pin and takedown pins in place,
perform the following test:
(a) Apply hand pressure to push the upper receiver as far to one side as possible.
(b) Attempt to insert a 0.020 inch thickness gage between the pivot pin lugs or the upper and lower
receivers.
(c) If the thickness gage penetrates to the pivot pin at all accessible locations, repair by replacement of
the upper receiver (see (b) below) or replacement of rifle is required.
2. If the rifle fails the above test, remove the upper receiver and install a "NEW" upper receiver and perform
the test again.
3. If the rifle now passes the above test, it shall be considered serviceable and continue in use.
4. If the rifle fails the test with a new upper receiver, this failure shall be considered a shortcoming. This
shortcoming requires action to obtain a replacement rifle. Once a replacement has been received, evacuate the original rifle to depot for overhaul.
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