If it's a pre 2013 demon I'd make sure to have a good supply of QEV diaphragms handy since they do need to be replaced here and there if you get lube on them. Run them dry for the record.
If it's a 2013, or an older one with the 2013 upgrades, it'll be amazing.
CCI stock class Phantom pump f/s. This thing is LNIB. Comes with stock magazine, extended magazine, barrel detent kit, crossfire lite up dot sight, velocity adjustment tool, 12 tubes even the barrel blocker
Ninja grey 50/4500 paintball tank f/s. Hydro good until 2019
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S