Im going to suggest you dont use something "permanent", at least for your first couple of paint jobs. If you use something like Testors Military Flats, you can remove it completely (with some work), if you later change your mind. Things like Alluma hyde II will require a bead blast to get it off. I wouldnt use the Krylon "Fusion" on plastics either. Standard Krylon Camo colors seem to come off like Testors though. Not sure about Duracoat, as Ive never used it, but I get the inmpression its more like the Aluma Hyde than not.
Not saying the more permanent paints arent good, they are, just that if youre not sure about what you want to do, its better to have options. Ive used Aluma Hyde II on a bunch of stuff, including guns, and with great results (you really do have to follow the instructions to the letter though if you want good results). It does make for a good base coat. If you use something like Testors on top of it, you can later remove the Testors, but the Aluma Hyde II will remain, and can be repainted over.
Ive been painting things since the 60's. Mostly I use Testors, as they were really all that was about that had what you needed, up until the last decade or so. Its good stuff, durable, and has pretty much any color you might need to match a pattern. Ive painted a number of guns with it, and totally removed it later, even years down the road. No matter what you use, its going to get beat up with use. Personally, I think they get better looking with age, and dings and scrapes really are not a detractor. They actually just help "soften" the overall look and finish.
This was my last paint job, my S&W M&P15 in Multicam....
to give you an idea as to how the colors match....
My 1100 here (on the bottom) in this pic and the Mossberg 500 with it, were both painted close to 30 years ago now. I decided I wanted to something different with the 1100 a couple of years back, and stripped it off (the 500 still wears its ASAT paint job). If you look close, you can see how little really wore off with pretty constant use over the years. Just the main contact points show the most wear.
The 1100 looks like this now....