This is an OEM Glock original factory replacement part. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation.
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)
Works with new magazines and old magazines with followers marked 1304, 1304-1, 1304-2, or 1304-3