[MrBasse]

Pay attention to R78-R80, if you add any pressure to the cylinder to pre-charge it you will need to use a robot controlled compressor that matches the set up in those rules. Also, with the system you described, according to the rules you will need a gauge and a regulator(even though you wouldn't use it). You would also be limited to 60 psi and if you compress the air in the cylinder you will have to do the math to find out if you will peak over 60psi when compressed.

Rules can be tough, I can't say for sure that all of these would be enforced in the full extent for your system, but I would think they should. It is really awful to get to a competition and find out something isn't legal. It's even worse to find out it is legal right after you tear your "illegal system" all out and replace it (oh 2012, you were cruel to us...)