The PDI Piston Head for the Tokyo Marui Hi-Capa is a great upgrade if you are looking for increased FPS and range. This part creates a better air seal in the gun's cylinder so that when the gas is routed from the magazine, the full potential of the gas's energy can be used to propel the BB and blow back the slide. It is highly recommended that the user upgrade the plastic slide to metal prior to, or at the same time, installing the PDI Piston Head.
For: PDI Winter Piston Head for TM Hi-Capa/1911 A1
There is not much to say about this piston head but it improves efficiency and with improved efficiency, you get increased FPS. with increased FPS, you get greater range. This piston head improves the seal in the nozzle. I paired this head with a Shooters Design loading nozzle and it works great.
slight increase in range
it is a tighter head and could inhibit movement of the nozzle. (not likely and not major)