It has high accuracy, 10 rounds/s, and access to Vigilante mods to buff your primary.  That 4% status chance turns into 13.6% after 4 dual-stats, and that's for each projectile.  With Vigilante Fervor, Vigilante Armaments, and Split Chamber, you're firing 36.25 shots/s, for an expected procs/s of 4.93.  This is slightly lower than the Prime Laser Rifle's procs/s, but the Prime Laser rifle reloads 20x as often and isn't hitscan.

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