TargetTalk

Here are YT videos that I think are relevant to this thread. They show a FAS worker disassembling the 6004.



https://www.youtube.com/watch?v=SKwN1tk61rs

https://www.youtube.com/watch?v=1URxdVa4y2c

I would advise against resting the cylinder against anything while driving out the trigger spring pin. Resistive support should be under the frame that houses the spring with something like a 'bench block' or 'jeweler's anvil'. A scrap block of metal and a drill press could easily make a custom fixture.