Self-explanitory.

Reservist's Rifle for long-range sniping; Perforator for close/medium range stealth kills; Silenced 10mm for stealth CQB; Gatling Laser for those "OH, S**T!" moments (Deathclaws, SM Overlords, Reavers, multiple tough targets). At lower levels, I like the minigun & Xuanlong Assault Rifle until I can get my hands on a Gatling Laser.