It'a fully automatic, that's why. Sentry is designed to work with semi-auto weapons.
Firearms scale terribly. Anyone running more than 2800 firearms is just gimping their build.
DPS can be increased by other stats like crit damage, headshot damage, etc. Investing in firearms beyond what is required to activate talents is not worth it.
Ideally, you would want enough firearms to activate 2/3 talents and get the one talent that requires higher stats on the free slot. Then you're free to distribute stats into stamina instead.
High skillpower and stamina lets you tank more damage and increase your damage skills uptime.
RIP showstopper.
15% base damage nerf to G36 is a lot, damn
No word on broken heroic incursions (esp on PS4). Dragon's Nest heroic still not available?