good idea the way he made the stencil

Great link. Such a simple way to to it

A friend done it two years ago and the paint even till this day never cured 100% even tho it feels dry. You actually can peel it of with your nail and if your hands were sweaty the paint would slowly wear off and it looked a total mess. Was nice when it was done but I wouldn't advise it unless the paints were durable. Maybe your better of buying a gun that has camo on it applied from the manufacture. Something like Beretta has Max4. I like the results in the link above but it can go wrong and also if it did you will never get all the paint cleaned off but personally I love camouflage firearms