Yes.
Contact SIG for a correct and accurate answers.
The mfg. Says yes you can
Some folks rather have a 357 revolver then a 9 MM semi auto as a revolver if it misfires you just pull the trigger again If a semi auto misfires you lose the battle as you have to manually reject the ammo and hope the next round fires. Of all the semi autos I did fire I happen to like the sig 226 9 MM the best
12-20 rounds depending on caliber and magazine.
Best left to a SIG trained armorer.
No, the only .357 auto is a Sig. Different shaped chamber.
9mm
Only in firearms chambered for it. SIG comes to mind, but, there are others.
SIG sn's are not in the public domain. You will have to call them.
MecGar
I believe they were first produced in 1984.
50-500 uSD