I picked up several rifles today from my FFL (the 10 day "cooling off" period had run its course). One was this sported No4 MKI. I think it can be re-milled without too much trouble.
I thought all the "PF" guns were MKII's.
https://www.milsurps.com/images/impo...01/02432-1.jpg
https://www.milsurps.com/images/impo...01/02542-1.jpg
https://www.milsurps.com/images/impo...01/01813-1.jpg
https://www.milsurps.com/images/impo...01/01912-1.jpg
https://www.milsurps.com/images/impo...01/02012-1.jpg
https://www.milsurps.com/images/impo...01/02223-1.jpg
All the numbers match...shame someone cut it up.
Notice there is some kind of shim in the barrel channel near the end.
https://www.milsurps.com/images/impo...01/02333-1.jpg