The Feinwerkbau 90 is probably as near to the 65 as you can get and have dry fire. It has an electronic trigger system. You get the solenoid click on pulling the trigger without the need to cock the action.
Do not dry fire a FWB 65. Fire only with a pellet or with some other load or resistance on the pistol (cleaning felt or against the carpet or cloth).
Firing a 65 with no load is the quickest way to destroy the buffers and springs, as well as break the locking bar.
DO NOT DRY FIRE.