The matt finish is okay but not good by any means.
I have hardly seen one that doesnt look a bit patchy as if the finish isnt very even.
On mine the barrel almost look grey compared to the rest of the gun.
I didnt keep mine on bare foam either,it was either on display or in a case that had the foam covered over in some micro fibre cloths.
Mine you I didnt take into account how long it had been in the box and on the foam in the shop before I bought it.
I kept is quite well oiled and it did help with the appearence of making it look more even.