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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