Massacre Mod Kit for Nerf Raider This kit includes metal trigger catch, 2x double strength trigger catch springs, reinforcement plate, 5+ kg mainspring (2.5kg stock), polycarbonate bolt sled with pin, polycarbonate breech with o-ring, polycarbonate plunger, and silicone grease. When installed, the Raider shoots 85fps muzzle velocity with up to 60ft range (parallel to ground) and up to 75ft range (30 degrees angled to ground) with streamline darts. Results can vary depending on how the darts interact with the inside of the false barrel. Mod at your own risk! Increasing the spring tension can break or damage stock internal components of your blaster. Blaster not included.