First post on this forum. 
I know it's an old thread, BUT...
I was unsure of the frame size of the 40/41 MOS's. Was it new or not?  This info about frame/slide swap fitting seems extremely obscure for the new MOS models (to me).  So, Thank you members of 10mm-firearms! Now that I know, my next purchase will be the G40 MOS.  One question, any (potential) extraction issues going from 10mm to .45 with just a conversion barrel swap?or vice versa just for knowledge.