Pure Pro MN

I really only use the ar and was wondering what good loadouts are? I use mobility active camo dexterity (can't decide that or stealth) plasma grenades.... What are your thoughts?

Well they should change something so I can play every map

Well how can I play the crimson ones, because the dlc playlist doesn't have them

So I just started up halo 4 again and I bought the new map packs. Is there a reason why I can't play them in infinity slayer? I've done the majestic dlc and did those maps but haven't seen any crimson maps yet?