I want to replace the existing forearm on my Model 12 with one that looks like a Trench or Riot Gun forearm. I think they were 18 groove and straight.

So far I can't find any information on how to separate the action slide from the forearm.
I can disassemble up to and including removal of the action slide screw cap but beyond that I'm unsure and don't want to mess something up.

If Tom or anyone else that could help with the correct procedure it would be much appreciated...

Thanks,

Dick