9mm/.45
Howdy ZBill,
What stans said...I've seen some of those swaps work like they were born together, and I've seen some that wouldn't chamber a single round. Also the
possibility that the frame and slide won't physically match up and require refitting. If both parts are from the same manufacturer, the chances go up sharply that they will fit...but no guarantees.
The magazines are available from Metalform.