Ar10 upper wont close, rear TD ping detent hole out of spec


The hole at the back of the lower is a hair off causing the rear TD pin to encroach into the lwr receiver well that the upper connect block goes into blocking it from closing… buddy was over and happen to have his dremmel kit with a round tip diamond bit the same size as the detent resting hole in the rear TD pin… was able to move the detent resting hole efectively moving the TD pin out of the area. Was wondering if there are fixes for these kind of situations like special pins whete detents are placed in various areas to achieve different fixes for close tolerances?