Okay I did this to my GSG5PK bolt and here are the instructions: I take no responsibility if you screw up your gun doing this, although if you do it correctly it is completely reversible. It could result in an out of battery detonation although that is highly unlikely. The purpose of this button is to prevent the firing pin from being in its forward most position until the bolt is in its forward most position and the trigger is squeezed. There is a spring in the firing pin housing that is already performing this function so this is a secondary safety.
First remove the Torx bolts holding the two bolt halves together. This requires a Torx #8 - the silver bolt is a Torx #10.
Here they are laid out by the holes they came out of.
next remove the set screw that is virtually impossible to see:
using a paperclip from the opposite side, push the pin out of the hole:
THIS PIN LIMITS THE TRAVEL OF THE FIRING PIN
Carefully remove the top half of the bolt, keeping your hand over the bolt so springs don't go flying.
Remove these 3 Torx bolts, they are #10 and you may have already removed one of them in step 1.
these allow the firing pin housing to be separated. Again the firing pin spring will want to launch the firing pin keep them in your cupped hands when separating.
Here is the culprit, it's a safety button that can rub on the firing pin causing it to slow, resulting in light strikes.
JUST REMOVE IT.
It looks like this with its spring:
Re-assemble by first putting the two firing pin housings back together loosely and upside down. Let gravity hold the firing pin spring in place. Slide the firing pin in from the back of the housing and eventually you will be able to feel when it is seated right and the spring is pushing it back. Once it is located properly, put the pin back into it's little hole. Push the firing pin forward until the slot in the firing pin lines up with the hole in the housing and the pin will drop into place and secure the firing pin. Secure the pin with the set screw. Then screw the 3 silver Torx #10 bolts back into place.
Put the one spring back on the long metal pin with the small end forward and put it back into the bolt housing. Put the second long spring on the second long pin and carefully put the other bolt housing in place by first securing the spring and pivoting the front downward. With practice you will become good at this. Expect to loose the spring a few times. Tighten the Torx #8 bolts back into place and re-assemble the rifle.
If you look at your firing pin you will notice a small partial circular notch cut into it that this safety button would engage with. It is intended to prevent the firing pin from moving into the forward position and setting off a non chambered round. However, the spring is pushing the firing pin to its rearmost position so this button is a safety mechanism. When the bolt is forward and the rifle is in fire mode this button is pushed in and allows the firearm to fire. But this button can rub on the firing pin, slowing it's forward progress resulting in light strikes. By removing it you are removing a safety mechanism of your firearm but you are also reducing the chance of light strikes.
When I removed the pin it changed the characteristics of my GSG from a worthless POS to a fun to shoot firearm. From what I understand this safety pin is unique to GSG and is not on a Ruger 10-22 or Remington 597 or other common .22lr rifles.