So.
Let me throw this here.
I want the gun to be as quiet as possible, filled the stock and barrel with foam and other sound absorbing materials, slapped a nice sorbo pad on the cylinder head, modified the internals of my suppressor, but there is still a very audible piston slapping sound, no matter what I do.
Most likely it's caused by the messed up volume ratio (I believe the AS-02 sits around 4:1 or something like that) so it got me thinking:
How can I reduce the cylinder volume?
Four main options:
Port the cylinder by drilling a hole;
Apply another sorbo pad to further reduce the piston travel (consequently reducing the effective air output of the cylinder);
Get a much wider barrel like a 6.20 or something;
Make an airbrake.
The first option is a big nope, I'm not willing to waste another sorbo on this gun, getting a widebore is out of question as well (because they're impossible to find here in italy), this leaves me with the 4th option, making an air brake..
I was looking at my piston (AirsoftPro one) and it got me thinking:
The pad on the piston head is held in place by a screw.
So I unscrewed it and noticed that the thread goes all the way through the other (spring) side:
Brilliant, now what if I can find a screw that has the same thread, but is longer? So I started digging around in my box 'o bits and found some old gearbox screws, which appear to have the same thread as the piston head hole (M3) but are much longer:
Voilà, fits perfectly
But on its own, the screw isn't going to do much, so the next thing I did was to apply some heat shrink (unfortunately I don't have pictures of this step) just to see if it would work.
And to an extent it did!
Now that screw, which is a M3x20mm is definitely too short and it gets even shorter when you consider the sorbo pad on the cylinder head.
So this morning I went and bought these:
Some nice M3x30mm screws, note the different head shapes (bottom is the one I fitted yesterday).
Also bought some washers and nuts.
Tonight, when I get home from work, I'll install these longer screws and apply multiple layers of heat shrink (approximately until the whole thing fills the nozzle) and see what happens.
What do you guys reckon?
Will it work?