There's a million threads like this, but is Accurized Ballistics, Shot Package and Rifled Barrel a roll you'd run with in PvP?
It's on my Titan if you want to suss it out.
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No because the Party Crasher already has really poor reload speed. Putting Rifle Barrel will make that thing reload at a snails pace. Reroll for the same things, but replace Rifled with Reinforced Barrel. Final perk I think is not so important with shotguns. Battlerunner, Army of One, Final Round, Luck in the Chamber, Kneepads, and a couple of others all work for shotguns.