You can grind the front of the accustock opening to allow a thicker lug. Plenty have done it. Recoil lug only needs contact on the back, so you can be very generous in removing material from the front of the opening with out any worries.
Another problem is that accustock recoil lugs have a different shape on the sides and folks have to trace the old lug over the new one and grind the new one to match. PTG sells savage lugs that have parallel sides, so I assume they're for accustocks, but can't confirm the fit since I've never used them.
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