I just saw a used Beretta 8045 Mini Cougar at my local gun shop going for $400 to $450 and I'm thinking of getting it instead of a PX-4 Storm Compact. But I would like to have the higher capacity of it in 40 S&W. Anybody know if the Mini Cougar or PX-4 models can be converted to/from 45acp to 40 S&W by simply swapping out the barrels and magazines? Or should I just be happy shooting the 45? Thanks!