Anthony I have Canadas number 1 Heavyweight, its a 4 wheel drive flipper running at 1000 psi and can be run up to 2000 psi.

My system uses High Pressure Air,my system is as basic as it can get, I have 1/2 lines on the high pressure side, I have two 3 inch rams that are feed by a 1/2 ball valve which is attached to a pneumatic actuator the rams are double action which the exhaust ports left open, on the main feed line I t off to another 1/2 ball valve which exhausts the line so the flipper comes down as fast as it goes up, no need to feed air into the exhaust side or bungee cords, the feed and vent are instant, with neither valve being able to be open at the same time.

The valves are feed by a low pressure line feedding from the high pressure, via a smaller regulator, in all the system is extremely powerful, both valves are rated for 2000 psi not that i will ever use that much power, but 1000 psi system is what I was aiming for and managed to build it on the 4 th attempt.
I also dont use a buffer tank.

Think long and hard before you go the pneumatic route, it can be a pain in the arse.