This package includes everything you need to upgrade your M16, M4, AK or SG/MP style airsoft rifle with a completely reinforced Bore-Up set.M130 Spring,Rotary Spring Guide,Bore up Cylinder,Bore up Cylinder Head,Piston body,Bore up Piston Head,6mm Bushing,Tappet Plate,Bore up Air Nozzle,Anti-Reverse Latch,Synthetic Lubricant With PTFE,(FTK 02U),** This Product is for Toy Guns Only **During checkout, be sure to choose the correct Tune-Up kit for your gun.  If you have ANY questions or if you are unsure about which kit is right for you, please call us prior to placing your order!

Systema, Area 1000 version 2 reinforced spring guide for Version 2 AEG gearboxes.

Systema reinforced spring guide for Version 2 gearboxes with a ball bearing bushing that helps reduce spring stress inside the gearbox.

Systema reinforced spring guide for Version 3 gearboxes.

Systema reinforced spring guide for Version 4 gearboxes.

Systema reinforced spring guide for PSG-1.

Systema reinforced spring guide for Version 3 gearboxes with ball bearing bushing which helps reduce spring torque stress inside your gearbox!