These CNC machined aluminium upgrade piston heads have been designed & manufactured In the United Kingdom specifically to replace the original green plastic cup-seal (Part No I-8) in the Tanio Koba USP .40 Tactical SD GBB which is prone to breaking when green gas is used.

The Lees Precision Engineering piston heads consist of a CNC machined 2014 T6 aircraft grade aluminium and a standard metric size O-ring to increase durability when used with green gas and also provide a better seal than the original cup-seals.

*Please note that the price is for one piston head only.