3x 5KG Upgrade Springs for Nerf Double Dealer, Recon, Alpha Trooper, Longstrike, Raider, and Deploy Set of three (3) 5kg custom fitted upgrade springs; compatible with Nerf Double Dealer, Recon, Alpha Trooper, Longstrike, Raider, & Deploy. WARNING: Does NOT work for Elite Alpha Trooper OR Modulus Recon MK II. Mod at your own risk! Increasing the spring tension can break or damage stock internal components of your blaster. Some blasters are extremely hard to reassemble, and we won't be able to troubleshoot problems due to user error. Blaster not included.