Just traded for a used high pressure barrel. Told it was low mileage, not fitted, maybe 200 rounds, and shot well. Tried it on the only receiver I could. Locked up with no gap. Alllllmost perfect. Grabbing the barrel (no forend) and the unloaded receiver and shaking, I got a tiny bit of side to side knocking. Took a closer look. Pivot, barrel face and most of latch shelf had no blue. And something I have not seen. A burr on the underside of the barrel latch shelf.
How does that burr affect lockup?
Do I need to take out the burr and flat file the shelf before matching it to a receiver?