besides, getting the cut square , not leaving an edge( proper crowning) and re-mounting the front sight can be an absolute b*tch- i had an old 870 this was done to ( picked it up for 100 back in the 70's) and it shot "hollow" patterns- nothing that a NEW BARREL wouldn't fix, or had the job been done properly, but it shouldn't have to be re-done- and it case you don't know what hollow patterns are- nothing in the middle, the shot is all around the outside of the ring- how it does that i don't know , nor am i interested