+1 on a parallel ground lug versus factory. To some it may seem unnecessary got the non-parallel surfaces where barrel nut meets lug and then lug meets action will induce stress when the nut is torqued. Maybe not an issue on the first 3-4 shots but as heat builds and you see your groups walking around on the target (if they still remain as groups) and you might want to consider just replacing the factory lug.
PT&G has them in varying thicknesses for under $40 in either C/M or SS. A cheap improvement if you want to eliminate "good enough".
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