Making KWA piston head usable.
 

Well..

I was about to order a brand new head set for my KWA when I first opened the mechbox.

KWA rifles come with an aluminium piston head... The only problem is that is it not ported!

Easy remedial.

Tools needed:

A Dremel or drill
Fine drill bits
A ruler

First remove the head from the piston and the o-ring from the head.

Then try to divide the piston head in 6-8 even section (they don't have to be perfect. I used a knife to mark the surface very slightlty)

Ruler time! Measure 3mm from the outer edge and mark the drilling spot.

Then simply drill with a small bit. I used a 1mm bit and a 2mm bit to shave the barbs.

Voila!

Improved air seal and no more suction!