In the UK hunting with AirRifle's is a big thing and because you have to get witin 40-60yards max to use them (UK power limit is 12Ft lbs without ticket)most hunters camo their rilfes. A comapy called Hydrographics is very popular for this. Have aq look at.......
http://www.hydrographics.org.uk/
They can do almost anything using their methods. Anyway just thought you guys might like a look.