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Make sure you get all gun oil and cleaning residue off.
THAT is the most important.
I painted cars for many years, and there are TWO things that will cause you a problem.
Foreign substances will cause the paint to either bubble or release later on. One of the best cleaning substances for synthetics would have to be alcohol. Just plain 'ole rubbing alcohol will suffice. Rub it on and dry it off. DON'T let it dry. A couple of cleanings should do the job.
Surface slickness is the other thing that will ruin your work. Someone mentioned a scotchbrite pad. I would prefer that to sandpaper because of the ability of the pad to get into the creases and crevices better. Scuff the stock well, but there's no need to actually "sand" the stock completely. You're just trying to give the paint a rough surface to adhere to.
Primer isn't really necessary on a synthetic stock. Primers were initially designed to hide minute scratches. Then they became valuable as a base agent because they would stick to metals and other materials that paint would oftentimes release from. Primer really isn't called for in this application. It won't really hurt anything, but you're just wasting time and product by using it.
Krylon has a paint out that is designed for plastics (don't remember the name). This would be the very best bet if you can find it in the colors that you need.
Have fun. /ubbthreads/images/graemlins/wink.gif