I just measured a 1/2x28 (Green Mountain) at .495 and a 1/2x36 (unknown brand) at .492. However, my calipers are cheapos. Hopefully someone that knows the answer will come along.
As far as slop, I think shoulder dimensions are probably more important. Do you have an alignment rod?
RLTW
Former Action Guy
Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.
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