Well there are many different BRANDS of ammuntion that you can buy for a glock. but obviously you will need 9mm bullets for a 9mm gun.
How many bullets can a 9mm baretta hold
Yes, you can find a wide variety of readily available 9mm hollow point bullets and ammunition.
P38
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.
Yes, a Glock 19 9mm magazine can be used on a Glock 23 since both firearms are chambered in 9mm.
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.
However many are cycled through them. Different magazines ("clips") hold different amounts of ammo. For instance, the Glock 17 9mm standard mag holds 17 rounds, but the smaller Glock 26 holds only 10. You can also get extensions to hold more rounds, like the 30-round extended mag for the Glock 17.
Yes
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 19 is the 9mm with the compact (midsized) frame.
Glock pistols are made in a variety of calibers. Currently available in .380 ACP, 9mm Luger, .357 Sig, .40 S&W, 10mm Auto, .45 ACP and .45 GAP.