Unless you are a qualified gunsmith and know what you are doing, don't ever try something like that. You can risk serious injuries to yourself and others, and at the least might damage the gun.
http://www.glockfaq.com/gunsmithing.htm#slideframe The 23 receiver is not compatible with the 38 slide.
There are carbine conversion kits which use the lower receiver of the Glock pistol, and mate it to a carbine upper, yes.
No. The 357 SIG magazine will not fit in a 40 caliber Glock such as the model 22.
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.
Whichever model fits your intended use and budget.
Glock 9MM Model's 17/19
You would have to define best- what what use.
There's no Glock with the model number "9", so I assume you mean a 9mm glock. The Glock 17 (full-size 9mm) holds 17 rounds in a factory magazine. The Glock 19 (compact 9mm) holds 15 rounds in a factory magazine. The Glock 26 (teeny-tiny 9mm) holds 10 rounds in a factory magazine. The Glock 17L/34 (competition) also holds 17 rounds. The Glock 18 (Select fire, full size 9mm) holds 33 rounds in a factory magazine. Higher capacity magazines fit and function in lower capacity firearms, for instance the model 26 can use model 17, 19, and 33 magazines.
No - they are very different cartridges.
Use the UPPER function
on the show Webster what did he use to get from upper level to lower level
This seems to be a persistent myth. The .40 S&W/.357 Sig magazines are not compatible with 9mm Glocks.