Fwb c60 junior to PCP?

[RobF]

if a regulator is fitted the working valve etc will be subject to the regulated air pressure so not a problem. but the air cylinder needs to be able to cope with the higher pressure from the air

Even so it wouldn't fail safe.

[TenMetrePeter]

if a regulator is fitted the working valve etc will be subject to the regulated air pressure so not a problem. but the air cylinder needs to be able to cope with the higher pressure from the air

If the firing valve seals perfectly but the reg has a tiny leak then its kerboom by morning.