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proverbial discord mod wannabe
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This is something I've never quite managed to wrap my head around.
I know that some pistons have holes on their piston head.
E.g. Action Army or Airsoftpro pistons (see below)
18896
18897


And I know that this is a good thing to have, however, I am not entirely sure why...?

In addition to this, would sticking a sorbo pad on the front of the piston head ruin these mysterious good qualities?
 

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They should line up with your O-ring groove and penetrate through, so they inflate your O-ring and increase air seal.
In theory.

If they don't hit the O-ring groove, they will have air that gets compressed inside, and when your piston impacts you cylinder head it will seal on the rubber, trapping the air, and the air will blow the piston back a little bit.
This will probably decrease the sound signature a little bit by shortening the whack noise.

They look cool

This is all theoretical, but I'm probably not too far off
 

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I am not sure about the O-ring groove but Silicone is correct. The holes are there so that air can go in and inflate the oring to help seal the piston.
 

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That is the o-ring.
Put the Sorbo on the cylinder head and not the piston head. You need the air to get into those little holes.
 
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