Magazine Spring -
9mm G17,G19X,G18,G34,G45,G47 all 17rd mags, including pre-ban, LE marked & current unmarked
10mm G20 15rd mags, including pre-ban, LE marked, and current unmarked
.45 Auto G21 use only in pre-ban, older LE marked mags w/ 3955 follower & 10rd mags
.40 G22,G35 10-coil spring - pre-ban mags & older LE marked mags Only (do not use w/ Tac-Lights)
.40 G23Gen5 10-coil spring