Gonna disagree with you on Krylon.. I've got 5 rifles that I've painted with it. Remember though that I don't consider my weapons show pieces and I'm not trying to win a coolest cammo pattern competition. The intent I have for painting my weapons is generally to create a break up of the rifle lines when you are about 15ft away from it.

The thing I like about Krylon is that there are cammo colors or you can use the flat finish ones. Avero is another kick ass brand. More durable than Krylon and the colors are specifically matched to the military number system. The Avero stuff can be bought in pattern kits from places like MidWay or Brownells.

One of the other things about Krylon and Avero that I like vs. the baked on finishes is that if you scratch it up or want to change it, just pull the can back out an touch it up where you need to.

I'm going to try to get permission to repost an excellent guide written by Pat Rogers. Its what I used to paint my ACR this time around and I am really pleased with the outcome.