GLOCK 10 Coil Magazine Spring. This is the standard spring for all 17 rd, 9mm magazines and all 15 round, 10mm mags. This includes pre-ban, LE marked, and unmarked mags. It is also the standard spring for pre-ban and older LE magazines with a 3955 marked follower. G22 and G35 pre-ban and older LE marked mags use this spring but not if the gun has a tac-light on it.
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.