MAGAZINE SPRINGS - 19, 21**, 23, 26-30, 32, 33 Adds 10% power
Glock 19 - 15 or *17 rounds
Glock 21** - 13 rounds
Glock 23 - 10 and 13 rounds
Glock 26, 27, 29 & 30 - 9 or 10 rounds
Glock 21 and 33 - 10 rounds
Glock 32 - 10 and 13 rounds (Law Enforcement)
Notes:
* With +2 extension.