AR15 Upper/Lower Sloppy Fitment Quickfix
grabcad
Everyone is familiar with the takedown pin slop between various upper and lower combos. I used the 4.4mm variant to entirely eliminate all slop between an older PSA upper and a newer PSA lower, results may vary. The takedown pin will be more difficult to manipulate.The number specified in the stl file is the distance from surface to surface. I measured my gap by putting hot glue between the surfaces, assembling the rifle, letting it solidify, popping out the hotglue, and measuring it with calipers.
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