I did my Bushmaster AK with the Krylon Ultra Flat paint from Walmart.
It turned out pretty good. I degreased it well, gunscubber, then alcohol. I taped off the sights and prepped a couple spots first, the inside of the dust cover and the safety in one position. when that dried, I closed the cover and moved the selector. I used the sand as a base, then OD finished with the mud brown.
I hung it in my backyard from a tree, coat hanger through the rear sight and AK brake. The patterns I traced onto two layers of heavy duty aluminum foil backed with either masking or duct tape. This allowed me to form it around places. I eye balled the patterns from some woodland BDU's, made a bunch so I had a variety. It took me a bit to do, but after the base coat of sand, I placed all patterns on the whole rifle and did all of the OD. I made separate pieces so the sheet with patterns fit around the handguard and part of the front sight tower as an example. I tried to keep the pattern slightly away from the surface so it had a blended border. I don't like the manufactured look, It looks nice when you are paying 2-3 hundred for the job, but nature isn't like that.
Remember a few things, BLACK is not a natural color, so I would leave it out. Use lighter colors on the high spots, darker on lower places. So, the end of the barrel, corners, etc should be light. Create irregulat patterns, and don't have them run the length of the weapon. You want to make it appear as if it's not one piece. A noticed a nice example of a camo job, if you go to new arguy's sir/firsch demo, scroll down and it shows a operater with a weapon that is cammied. Notice the way most of it is done, it blends well.
I didn't clear coat it, it wears well though, it will get nicks, oh well, touch it up if it bothers you. All it takes is patience! Good luck, let me know if you have questions. I could get a pick to your email if you send it and you can post it if you like.
If you only want to do the stock, I would use the Aluma-Hyde II or the HS camo. You can put these in your oven on 175 or so once dry and to speed up the process. Otherwise, 2-3 days hanging in a hot attic work well.
Mark