GLOCK Magazine Spring; 9mm, 10mm, .357, .40, .45 Auto (10-coil)
G17, G18, G34: all 17-rd mags, incl. pre-ban, LE-marked & current unmarked (std 10-coil spring)
G20: for all 15-rd mags, incl. pre-ban, LE-marked, and current unmarked
G21: use only in pre-ban, older LE-marked mags with 3955 follower & 10-rd mags
G22 through G35: pre-ban mags & older LE-marked mags (do not use with Tac-Lights)
We recommend this spring as an extra power mag spring for 15 round, 9mm mags and 13 round .40 and .357 magazines that are using the GLOCK +2.
Models: G17, G17L, G18, G20, G21, G22, G23, G24, G25, G26, G27, G28, G29, G30, G31, G32, G33, G34, G35 (including Gen4)