KSG (T.Marui) CNC Aluminium Hop-up Chamber part No.50

This item is manufactured by precision CNC machined.  It:
1)   only suits KSG(T.Marui). It does not fit M870(T.Marui) ;
2)   improves smoothness of loading BB;
3)   increases hop-up performance;
4)   strengthens construction and durability;
Remark: for the best air-tightness in the hop-up chamber and smoothness installation, please put some lubricating grease all around 3 hop-up buckings and barrels inside the hop-up chamber.