No. The mags for the 9mm are different than the mags for a .40 S&W
do you mean a 229 instead of a 228? my gun expert seems to think it would be the 226. these guns are used by the navy seals and Texas rangers. No, there is a P226 (full size model) and a P228 (compact) both are 9mm
Yes.
No. Some .40/.357 Sig pistols can be converted to fire 9mm simply by dropping in a 9mm barrel and using the 9mm magazines, though. Not sure about the Glock.
Sig
No.
The .357 Sig is a 9mm projectile, loaded into a necked down .40 S&W casing.
No. .357 Sig and 9mm are two completely different calibers and not interchageable.
Follow the instructions provided by SIG
You will need to contact SIG to find out.
Yes
She usually uses the Sig P229 but in some occasions is carrying the P228 or P239
9mm