Tridos AAP-01 Recoil Spring Upgrade (Set of 4)

→ Reduced bolt cycle time → 4 different strengths Stronger recoil springs made for the AAP-01 / AAP-01C. Improves bolt cycle time and increases rate of fire . Covered in durable gold zinc coating . Comes as a set of 4 different strength springs: 120% recoil spring 150% recoil spring 180% recoil spring 210% recoil spring ⚠ There is no clear guidelines on which strength you should use! Each build might require a different strength depending on bucking, rate of fire, nozzle and bolt assembly.