Evening Paul. I was very hopeful, as I am sure you are now, to see if I could convert P14 mags to run in a P16. I found 2 issues when I started down the road.
1) feed lips are just a bit wide. No problem I took some material out and welded it back up.
2) The width on the 45 mag is too wide. This is the one that took my attempts out.
If you can squeeze the feed lips and get a spacer to work you just might be able to make it happen.
Other than that I would say simply use it as a barny mag and move on.
George