MM, anybody stupid enough to take a grinding stone to a 1911 feed ramp shouldn't own a 1911.. or any other gun for that matter.
Trust me, they are around..........some try to "improve" the barrel throat & in doing so, screw that up, so then they think they need to "fix" the feed ramp because the barrel doesn't fit it correctly anymore.
As I said, lots of bubba's..........
MM