Nanoweave's also still a viable choice on Medic (unlike HA). It synergizes well with the Nano-Regen Device as NW effectively increases the defensive value of each HP, meaning both that you're less likely to need to pop your heal on during a fight and that the heal is effectively stronger if you do -- running NRD + NW increases your effective total health during a fight in a way that ASC doesn't. If you run ASC you're trading survivability for utility. It also works well if you run Regen Field instead, for much the same reason (albeit in different circumstances); unlike ASC, RF regens your shields even while you're in combat (though of course RF is worse than NRD for anything other than supporting a concerted effort to hold a choke point or building).
But yeah, in terms of weapon the stocks are all decent and Ozy covered most of the pertinent stuff.
If you're on a VS toon, get the H-V45. It's by far the best VS AR; the rest are mostly shit compared to their TR and NC role counterparts (except the Terminus, it's okay), and it's the closest you'll get as VS to Easymodo TR weapons. Get the H-V45 and don't fight at long range, period. The Equinox and Burst are meh, the Pulsar is rubbish, the Corvus is shit, the CME is a joke. If you really need a medium-range AR for your VS Medic, get an NS-11A, it's better than most of the faction options.
If you're on an NC toon, the Gauss Rifle is excellent in skilled hands. The Carnage is great. The GR-22 is "Why aren't you using a SMG?" The DMR is fucking fantastic if you can aim.
If you're on a TR toon, it doesn't matter what you use, just follow the two step guide. 1: Point shooty end at enemy and depress trigger until all rounds are expended. 2: Enjoy effortless kills. Seriously, though. T1 Cycler: Point and hold trigger. TAR: Point and hold trigger. Cycler TRV: Point and hold trigger. SABR: Point and click with those two-round bursts, murder M1 clicking if you get caught in close quarters. TORQ: Point and hold trigger.