i wanna get a ACOG for it

i know i dont like the socom silencer either, i bought a...i cant remember if it was a king arms or a deepfire silencer but the friggen threads were stripped!!!!! and i ordered it from HK and im not sure what to do :-/ i was so pissed im gunna get a tanaka M40a1 in a couple days and im thinking i should paint it like i did with my famas...should i do it or leave it black???