Yes
http://www.patrolbase.co.uk/gas-and-lubrication/coleman-propane-fuel-465g.htm#.VFsn4PmsWSo
You'll need to buy an adapter, which simply screws on.
http://www.patrolbase.co.uk/airsoft/airosft-innovations-propane-adaptor-kit.htm#.VFsnzvmsWSo
.25g's work best for me, same with propane.
For maintenance, a little bit of silicone oil on the firing mechanism should do just fine. Gbb pistols don't require massive amounts of maintenance.