Might have better luck dipping the rifle. It can be fairly durable with an epoxy or similar top coat. Kryptec would be a difficult pattern to do even with good stencils although their might be some who do this.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli