ive done a few. there are a couple issues you need to consider.if you want a long lasting durable job. its all about prep work. some of these plastics use release agents that are tough to get off the plastic and makes it hard for the paint to stick.i would lightly scuff up with a pad or use like 600 grit sand paper and scub with dish detergent .an airbrush works nice. duracoat is what i like to use.its a 2 part finish that takes a couple weeks to cure but is tuff stuff.
http://www.lauerweaponry.com/ if your not picky and want a quick semi durable finish i would use the krylon camo fusion spray paints. you may wanna use a matte clear krylon to toughen up the finish from scratchs.another paint to consider is the truck bed liner in the can. it will give you a texture finish though. you could also give it a factory webbing look by using krylon webbing paint in the spray can over the base coat of the bedliner in the can.
http://www.autozone.com/autozone/acc...ier=98214_0_0_ i did a shotgun stock and was amazed how it turned out. looks like the big dollar custom stocks.
http://websearch.cs.com/cs/boomframe...p%2FB000XAOJG8