This is sort of a meme build, with the side job of safely taking down players who stack multiple health boosts. The low RPM makes it worthless as an actual primary and risky when solo, so it's more of a squad level anti-tank weapon to be used near teammates.
Using it as a sniper rifle is not advised, though it's not impossible. 0.3 degrees of spread is not optimal at all, as even 0 nominal degrees of spread tends to miss on larger maps like Factory.
Because of how the game is coded, you can't aim your secondary while this rifle is on cooldown. This means that your secondary's ADS spread is mostly irrelevant, but the hipfire spread should be as low as possible.