Fairly straightforward 6pc Sentry build, emphasizing headshots and headshot damage.
Pretty vanilla, nothing particularly innovative about it, but it does good damage. You can swap out crit chance mods for purple Damage to Elites mods, but I don't do that b/c I'm too lazy to swap them around for when I won't be facing elites a lot. You can also go full firearms mods instead of 3 FA/2 STA, but I like having a bit extra health since medkits are really my main sustain.
Also, I will often drop pulse for some CC skill like fire turret or flashbang, since a lot of people run pulse. In which case, I will remod to support station duration or something. The turret/flashbang then feeds the damage from the MDR b/c of the dmg buff on status effects.
I consider going strike back instead of combat medic, but good teammates use combat medic, and since this is PvE build, I SHOULD be able to rely on a decent healing station to recover health, or as a last resort drop my revive box for a quick burst heal or revive.
The thing I find really fun about this build is that with the M700 Carbon, I can drop marks on a target and start hitting REALLY hard despite not having marksman gloves. This is really fun when the marks jump b/c of 6pc bonus, and then I can one-shot elites.