The goal of this build is not to kill, but to inflict the most status per second.
no sentinel weapon nor moa weapons can kill anything at high levels (and I mean levels above 60).

with multishot at 2.5, status chance at 106.5% and fire rate at 2.27 you are guaranteed to get at least 2 status per shot, and an average of 4 status per second.

It can go up to 8 status / sec.

you can forma 1 more and get [Rifle Aptitude] maxed, for a total of 111% of status chance
or, alternatively, knowing that the radial attack range is 3m you can put [Primed Firestorm] in it.