Brake fluid and Simple Green are really good at breaking down acrylic paints. Get a brush about as stiff as a toothbrush, maybe a little tougher, wet the bristles with the brake fluid and start scrubbing. After you've given a section a good scrubbing, wipe it off with a damp cloth and repeat as necessary. I've been stripping plastic models of paint like that for years (although with those i can just dunk them in and leave them for a while lol, don't think you'll want to submerge your whole rifle :P).
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