While I would be okay with a buff to the Anubis, I wouldn't say its necessary.
I think this is the mentality people should have. If anything, jokerbox weapons should all be nerfed to the Anubis level. Why would you want paid guns to be good? I know you could argue that the beauty of JMB weapons is that you can get them permanent with in-game money, but the better the gun, the more ridiculous the in-game cost is. So buffing it doesnt really help you in that respect. The gun has a unique skin, sound and crosshair, to me thats enough for it to be legendary.