As already said, don’t buy a two tone then paint it straight away, that is manufacturing a RIF and you need a defence. What you can do is wrap your gun in a scrim scarf to cover the two tone, the gun is still two tone underneath so you are perfectly legal. Paint it once you have a defence in place.
As for the sniper idea, again as others have said DON’T DO IT! Buy a G&G CM16 Two Tone and learn the game before you try sniping or you will probably jack it in after a few games. Or you could get a TM M14 with a two toned stock ( easy to wrap in scrim scarf and easy to camo paint later ) this gun has quite a good range and is popular with DMR Types, you could experiment with quasi sniping with it, but still have auto and big mags for those fast n furious moments.