I am in the process of building an AR15 in .204 for myself. Just finished machining my lower. I was going to just do the typical Flat black, but then looked over at all my custom acidwash/splashed paintball guns I have, I decided I wanted my AR to to have an acidwash/splash/sponge anno. I asked on one of the gun forums i'm on, and they were less than helpfull.
No, type 3 will barely takes dye at all. All you can get out of type 3 is your blacks and greys, and some hideous looking colors.
Would it be possible to go with type 2? The only difference is the thickness. And type 2 as you probably already know takes dye very well. Maybe run a dura coat clear for more abrasion resistance?
Btw an acid-washed AR would be the bomb.
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Honestly, I would go with type III dust black, but you should do what you want if you went to all the trouble of machining and building your own.
.204 Ruger huh?! Should be a fun (and fast) plinker.
Old school splashed would be my second choice.
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