The Glock models leading up to this are
17, the full sized 9mm model. 4.49” barrel, 17 rounds
18, the 17 but select fire
19, compact 9mm model, 4.02” barrel, 15 rounds
20, full size 10mm model, 4.6” barrel, 15 rounds
21, full size .45 A model, 4.6” barrel, 13 rounds
22, full size .40 S&W Model, 4.49” barrel, 15 rounds
23, compact .40 S&W model, 4.02” barrel, 13 rounds
24, long slide .40 S&W model, 6.02” barrel, 15 rounds
25, compact .380 A model, 4.02” barrel, 15 rounds.
The Glock models leading up to this are
17, the full sized 9mm model. 4.49” barrel, 17 rounds
18, the 17 but select fire
19, compact 9mm model, 4.02” barrel, 15 rounds
20, full size 10mm model, 4.6” barrel, 15 rounds
21, full size .45 A model, 4.6” barrel, 13 rounds
22, full size .40 S&W Model, 4.49” barrel, 15 rounds
23, compact .40 S&W model, 4.02” barrel, 13 rounds
24, long slide .40 S&W model, 6.02” barrel, 15 rounds
25, compact .380 A model, 4.02” barrel, 15 rounds.