I agree with Lump, Paypal is well worth perserving with as once you have your account setup it really easy to use.
As for the PM7, keep the bolt freshly lubed with any Dow33 based lube
(new style dye lube, sl33k, hatersauce or MonkeySpunk)
Service the regs every 3-6 months depending on how much paint you are putting through it.
And thats pretty much it
...oh an the stock Pm7 barrel is a 2 piece 12" .690 proto barrel, honestly I'd recomend keeping the stock barrel andjust getting a 14" UL tip for it.