when it came time to change recoil springs i decided to go with wolff springs....and they work great. when you buy a wolf recoil spring the include a factory power sriker spring for some reason. the striker spring that wolff includes in thees packages is a little shorter and a little smaller in over-all diameter than the glock oem striker spring. even though wolff says thees are factory power striker springs.... i am a little worried about using one. i learned very early on ( the hard way) that bad things usually happen when you fool with your glock striker spring. but if they are actually factory power then what is the harm? should i replace my striker spring with this as wolff gun springs recommends? or should i just keep tossing them in the growing pile of spare glock parts? have you actually used one?