Hide in cover and toss seekers at the enemy. As needed, swap the BFB to a flame or pulse turret depending on your needs at the time. Toss seekers so that they have to roll to their targets as this will give time to toss the turret or BFB and take advantage of Barrett’s bonus before the seekers go on cool down. At 420K skill power before Barrett’s bonus goes off the seekers are back in ~10 seconds and the turret in ~15. Swap guns for required bonuses as needed. "NOW GO BLOW SOME SH*T UP!"
This build can go from Mr. Torgue to Dr. Zed by swapping to medical skills and talents instead (life support station, defib first aid, combat medic, critical save, battle buddy and triage, heal ally mods). "If you ain't dead, I'll keep you that way."