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- Adjustable Hop-Up System by KSC
You can add any accessory on top if you want
free floating rail for AR15 systems
The design of the rail is developed from the legendary MRE (Modular Receiver Extension) RIS
Guarder Stainless Steel Bore-Up Cylinder Head for Version 3 Gearbox Rear Position - Adjustable Hop-Up System byEssential part for upgrading your Airsoft Electric Gun AEG Bore Up Series upgrade part Increase bore size means greater air capacity & volume for propelling the BB forward Double O Ring Design increase the air tightness of the cylinder This is highly recommended upgrade for AEG with lengthened barrel since you need additional volume of air to propel BB out of longer barrel For GUARDER or SYSTEMA Bore Up Cylinder ONLY As always, upgrading AEG require
