You have to be mindful of your striker spring weight if you step down to 11# springs in a Glock. Often, a 5.5# OEM striker spring can start pulling the slide out of battery at full striker cock, and accuracy can suffer. ISMI 11# springs work well with Wolff 4.0# and 4.5# striker springs, but keep up with your gun cleaning for reliable operation. Striker gun recoil springs and striker springs oppose each other, so keep that in mind.