Hi All,
There is no money to be made on the conversion (as mentioned earlier). Even as a labor of fun, the problem I've not been able to overcome is a rock solid reliable magazine of 30 rounds or better.
Some STens have removable mag wells. So long as the S/N was not on the mag well, the 16/22 mags from BDM and others would be a great candidate. Unless it is a MkV, the front sight has to come off to change the mag well. Nobody wants to pull the front sight in a caliber conversion. Again, dead end.
The Bingham 30rnd that JAC used in the early '16 conversion kits would be a candidate if available. Unfortunately JAC Bingham magazine would be cost prohibitive as most folks want a bunch of cheap, reliable magazines. At least the Bingham mag fits into the Sten mag well and has been shown to be reliable. If I do a kit for myself I can scrounge enough of these magazines to make it work.
I was involved in magazine development once. I don't care to do that again. I do think I've worked through the problems of the conversion from tolerances to the fixed ejector.
While others may have had good luck with the BDM Uzi magazines or the plastic Mac 22RF magazines, I've had mixed results. Any thoughts would be appreciated.
Enjoy,
Grasshopper