I have one out of 3 that the burr was bad enough to cause it to wear quickly, but it is a good idea to check them when apart.
Ok I was ready to call this project done but as in life chit changes.A special call out to Charles AKA 2A Georgia for the donation of a almost new p -17. Thank you Charles!So the saga continues.Knowing that my barrel had iffy rifling I can now replace it with the donor barrel witch has neat clean rifling and good crown. Pushed a pellet through and had crisp rifling marks and no tight places with smooth exit. I will machine the donor piston for a secondary o ring and maybe a wiper in between. As per WyoMan