The Accu Wedge is the solution for a non existent problem, due to the design the fit of the upper to the lower doesn't really affect accuracy in an AR, a loose one will shoot every bit as good as a tight one, any observed effects are strictly psychological.
I don't have any ARs that the accu-wedge will fit into.
If your cheek weld is so spot on perfect and repeatable that the upper/lower slop is causing inaccuracies, then maybe you need something like the accu-wedge. However, I'd suggest a JP tension pin to replace the rear pin as it is not elastic like the accu-wedge.
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