Technical information

Practical A.E.G Upgrade 2006

Why is it useful to put holes on the piston head? Any alternative?

Why (and why not) should I use a metallic piston head?

How about a silent head set?

Upgraded piston heads usually have holes on the front face of the head. When

the piston is moving forward, air goes through these holes and forces the

surrounding O-ring outwards to create a seal for preventing air leakage.

On a stock TM piston, it is quite difficult to take the piston head apart. However,

as long as you are careful enough, there is no need to take it apart. Just remove

the O-ring temporarily and then drill the holes directly (use a small

battery-powered drill only – a drill that is too powerful will break the piston

head). The holes do not have to be big. A diameter of 0.18~0.2 inch will do just

fine. Do make sure that the face of the piston head remains completely flat.

The number and position of the holes do matter. You want to have at least 4

holes, and based on our experience there is no need to have more than 8 holes:

Some people prefer to cut the piston head into slices instead, which is not

recommended as this approach will make the piston head more fragile then it

should be:

4 holes are good enough for

gentle performance

improvement.

A 8-hole configuration offers slightly more

performance improvement over the 4-hole

configuration.