That's a nice combination. Looks like a square forge upper to me, not the earliest variant, but the midrange one. Should build up to be a nice rifle. I'd use a NDS-XM16E1 lower with it.
If you want it refinished, the only way to get the stuff off will probably be media blast. Unless you can find some "Dad's easy-spray" paint stripper. That stuff might take it off.
If you need to blast, I'd let US Anodizing do it and refurb it to it's original finish. They'd have to strip and reanodize. Your finish will then be the same as the lower from NDS.