I painted a couple *crap* soft lol....
I coloured the insides with a permanent marker, sanded the outside, washed it, then painted it with krylon camo flat black....
From what I noticed, you need like no painting skills compared to other spraypaints hehe... Just my opinion though, it seems its so much easier to paint with krylon camo flat black than other spraypaints I have used.... Just don't touch the part you sprayed at all for like minimum 5 minutes, after it is dry enough to lightly touch and turn over or whatever you wanna do :P
Left is crappy Walmart Springer
Middle is painted crappy Walmart Springer
Right is KWC CO2 sp2022 with metal slide
Krylon Camo is cheap and really easy to paint, probably spray it twice... or more if you want...
If you ever do scratch it, it will still be black if you coloured underneath it... And you can always just lightly spray it again to cover it up lol...