Theoben Rapid Forum

Can find videos for Mk1 but not MK2. Does anyone know of any or are they bascically the same procedure?

Only differences are the trigger type, adjustable bolt & reg.
Mk3-4 triggers come out as a cassette,
there's a guide to the sporter trigger on here, likewise there's a guide to the adjustable bolt on here, and there was a recent post where I put a colour coded photo for changing reg O rings,
regs are simple provided you don't undo the nut at the top & you mark them to reset the same ie count the turns.

Changing all the O rings if leaking is actually pretty simple.