The range on MTAR is too good to miss. However, i prefer the TTK on the Vepr. Scratch that, i prefer the TTK and feel of the K7(9?) but the range leaves me hanging so i leave it close range maps. If you want unsilenced close range beasting, go Bizon.
Honey Badger, FAD and AK12 for ARs but it depends on your routes and how exposed you leave yourself as to whether you choose a AR or a SMG.
For perks, SIT-REP is a big one for me, not only does it prevent alot of deaths via IED and IMS but it helps you to spot and take down Satcoms which could save you using Off the Grid. It also often gives away locations of players via their equipment. Oh and one of my favourites is destroying Armor satchels which are really difficult to spot without it. I began using it as an adaption to the abundance of IEDs and campers.
I'd also vote for dead silence, marathon and ready up, almost as must-haves.