Hiya all.
The official stand on own markers at DF centres is that the last say in the matter is with the particular centre manager, because he is the guy who will be checking your marker for fps, ramping, burst, turbo, response triggers (bouncing to the verge of full auto) full auto or any other assisted firing mode. This is why the call centre guys can't give you a definite yes or no. Players are spot checked for fps and firing modes randomly during the day for the benefit of other players who are using our semi-auto Infernos.
Guns that are CAPABLE of firing in assisted modes are fine provided they have a semi only tourney lock (ie needs a tool to take it out of semi, not a push of a button) and provided it will run on a DF co2 bottle, which have the anti-syphon point marked onthe valve.
No 'own cylinders', be it air or co2, can be brought to a DF centre (not even for filling) because we have no way of knowing how well your valve has been fitted to the cylinder.Having your head blown off your shoulders by a bottle rocket would probably put you off playing paintball again for some time
As the other guys said above, own goggles (ASTM or CE approved and unmodified) and own hoppers are fine.