The barrel is mint and replacement threaded barrels are few and far between now so I don't want toss it. Seems to me sanding down the front of the receiver will only cause the barrel to over time. Am I correct in this thought?
The country that has manufactured milled AK's the longest - Bulgaria - abandoned threaded receivers for press-and-pin ones.
Much faster and cheaper to manufacture, and it greatly simplifies the assembly process. Barrel installation and headspacing are done the same way as for stamped AK's. Push the barrel in with a press and drill for a crosspin. No worries about timing.
I had some of my threaded Hungarian AK-47 barrels modified by a member here, falarkar15, for use with Bulgarian milled receivers. He turned the threads off and left a perfect 23mm barrel journal.
When I first posted this, I got some shit from somebody for "killing" the AK's, but this modification will allow me to assemble them onto genuine OEM AK receivers. I understand that the Firing Line made (makes?) threaded receivers, but I much prefer the Bulgarian ones.