Balystik HPA Drop-in adapter for AEG Stock tube

This adapter replaces the spring guide of a GearboxV2 when you set an HPA Drop in System. It allows to come fix the screw of the butt tube while avoiding contact with the solenoids, prevent unwanted weight as well as play and potentially unpleasant noise.The size of the thread is compatible with most M4 replicas (screw size: M4) Tokyo Marui, VFC, G&G, King arms & clones. It is also compatible with drop in systems like Polarstar Jack, F1 & F2, Wolverine Inferno & Reaper, Redline Hurricane & lighning.