Immortal Kit for Nerf Longstrike This kit includes plunger rod, breech, plunger body, bolt sled w/pin, metal spring retainer, trigger catch, metal trigger, trigger catch springs, trigger spring, 5kg & 7kg main springs, o-rings, and white lithium grease. When installed, the Longstrike shoots at 100-120 FPS (feet per second). Mod at your own risk! Increasing the spring tension can break or damage stock internal components of your blaster. Blaster not included.