Resist the impulse to make this a Lethal Torrent + Accelerated Isotope rate-of-fire machine. By default you only have 6 shots (the 20 magazine is wrong, there are only 6, period) and timing the reload is pivotal to this weapon's success.

The gimmick of this weapon isn't the direct hit, but the reload which deals red crits to obstructing targets as the projectiles recall to your hand.

To this end, [Ice Storm] as two additional shots to the magazine (for 8, not 6 as show here), increasing the number of red crits scored on such targets.

Gameplay requires cunning (sorry facerollers, this is not for you), aiming for headshots as much as possible, then positioning a target between yourself and expended rounds before manually recalling the blades and eviscerating said target. Note that Warframe reloads an empty clip automatically, so the 8th and final shot of this weapon will also trigger the recall. Use the timing of this in your favor when possible.

Blast+Electric are chosen here both because of the heavier hitting Primed variety inherent to secondary weapons, but also because their status proc will AoE to adjacent targets. For stealthier needs, swap [Primed Convulsion] with [Pathogen Rounds] and swap places with [Primed Heated Charge] for a classic VIral+Heat build that won't trigger collateral damage.