Unleashed Solid Final Stage Kit for Nerf Rampage This kit includes POM plunger rod, metal reinforcement plate, metal trigger catch, polished metal trigger, 5+KG mainspring, silicone grease, o-ring, trigger, trigger catch springs, and plunger head plug (Optional: needed in certain Rampage versions) When installed, the Rampage shoots 90fps muzzle velocity with up to 70ft range (parallel to ground) and up to 80ft range (30 degrees angled to ground). Mod at your own risk! Increasing the spring tension can break or damage stock internal components of your blaster. Blaster not included.