The piston choices finished up being indeed updated for perfect fit and dampening in unique big bore surprise systems. The 2-hole pistons (1.6 and 1.8mm) are a fundamental element of 2.0mm and 2.5mm degree alternatives. Furthermore, two sets of blank pistons both step-by-step choices are included for particular individualized modification. All pistons are made out of Delrin and so are also molded utilizing ultra-high accuracy moulds.