Pharmboy answered correctly Ramcharger.
The units are always lined, so there is no worry about marring any finishes. As far as deployment, it's as quick as you hit the switch.
In my applications, we use a special timer, that holds the solenoid on the lock open for 15 seconds. We mount our 870's overhead, and AR's in the trunk horizontally.
Most used police units will have pretty low mileage in them, oftentimes only used to remove the shotgun before the car goes in for service.