Wolff recoil springs for Glock 29, 30 and 36 are matched sets of inner and outer springs. Extra power spring sets help improve recoil function in these pistols. Springs are for use with Wolff Guide Rod Components. Springs are non-captive for easy changes on Wolff guide rods listed below. A replacement factory strength striker spring is included. Recoil springs fit over your handgun's guide rod and control how the slide functions. In general, heavy loads need heavy springs and lighter loads need lighter springs. A spring that is too light can cause the handgun to open and close early and hard, increasing the felt recoil and battering the frame. A spring that is too heavy can cause the slide to be hard to open and could even keep the gun from cycling completely, jamming it. Installation requires disassembly and reassembly of the slide. Factory spring is 17 lbs. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or repre...