sabotloader
Since we are having fun guessing I will venture one too.
To me the idea of a sliding block considering they will want economical processing would mean the block slides back over the hammer to clear enough space for priming and unpriming. I would guess it will run on rails and let the hammer back down on a bar so it can not fire and that you would have to pull the hammer back to fire it after the block is locked in position for safety sake.
Ti will be fun to see who's guess is closest. Lee