Hi you can tell the diffrece between a Classic RT and a RT Pro by the Valve Fieldstripbolt. The Classic has a Banjo bolt which the Air is going thru. The Newer Valve dont. The newer Valves Feed air thru the side. The Classic RT Valve feed from the Bottom. The Classic has normal a Hardline from the Frontgrip to the Rail. The air vent thru the Rail into the Banjo into the Valve.
Thats the biggest Diffent between them. You can not really upgrade the Classic RT very much. If you Valve Drilled you can put a ULT in it and a new Barrel. Thats all so far I am aware of. I own a Classic RT and it never failed me. The next Diffrent is i think the Body. The Classic body is going over the Valve.
I suggest you get a RT Oring kit from AGD or one of the Dealer on AO and Lube. A lot of Lube. Then go ahead and change the O-Rings out and lube everything very good. The Mag love Lube/Oil......
If you have any question ask. The Mag like pressure over 500PSI. The more input pressure you give the Mag the faster it can cycle, the higer the rate of fire. I had mine up to 21BPS. Just with an Inputpressure of 1200PSI,lol
Little_Ho
Oh btw i know everyone loves Pics so here is mine ULE Custom Mag:
