Some one said one time that he took the firing pin/ striker out of a handguns , so it was " deactivated" sure maybe for a training course, but legal wise its' still a registered hand gun.
These days all revolvers are welded shut, and cylinder welded, so I don't know what the point would be, you can't pull the hammer or pull the trigger, or rack the slide on a semi auto.
Fast draw, you can do that with a old school cap gun or crossman BB gun , Price out a Good Dewat, you will see what I mean.
Antique, sure that will works, if you want to spend 2 or 3 grand. Check out the Switzer auction listing coming up in a few days.
PS , if you buy a " deactivated gun" from a store or dealer, it should come with the paperwork from the RCMP, or at least a receipt stating what it is and status , otherwise it still may be in the system as a " real firearm"