Yes.
Yes
9x19mm, also known as 9mm Parabellum or 9mm Luger.
The common 9mm cartridge is known by many names. All of the following 9mm's are one and the same: 9x19mm, 9mm Nato, 9mm Luger, 9mm Parabellum. There are no 9mm cartridges specific to Glock or Smith & Wesson.
9mm
Yes, a Glock 19 9mm magazine can be used on a Glock 23 since both firearms are chambered in 9mm.
515 USD
A Glock 19 is chambered in 9mm. 9mm is one of the most common/popular pistol rounds.
Glock is a brand. 9mm is a caliber size. So, there is no difference between a 9mm glock and a 9mm of another brand as far as caliber size.
No. Because a Glock 26 is chambered in 9mm, as a Glock 23 is chambered in .40 s&w. For example you can use a Glock 22 (full size) in Glock 23 (compact) and in Glock 27 (sub-compact) But you cannot use Glock 27 mags in Glock 23 or Glock 22.
Glock 9MM Model's 17/19
No. .357 Sig and 9mm are two completely different calibers and not interchageable.