It already technically has precision instrument at least in PvE. It gains bonus damage for each stack of Paracausal Shot, just the final round was adjusted accordingly there so it doesn't gain—I think each stack increases damage by 10%? And as great as PI would be on it, especially in pve, even I'd have to say that'd overdo it when it also already gets like +5 range per stack as well. PI is just an artificial range increase on top of the actual range increase it already gets on a weapon that can already roll Rangefinder or Opening Shot. The most I would consider doing to it is either increasing the mag capacity and possible stacks by 1 (the damage buff stacks 1-7 unaffected). Years ago I would've done more than that because until Witch Queen it had the IMPACT (not damage) of a 180 and even benefitted from a few buffs that archetype got. But as it stands, it's a 140 with the mag capacity of a 120 and the stats of a 150. Perk-wise? Just finally enable tiered exotic weapons because I genuinely don't see what that would break that isn't being broken by like 13 other weapons, legendaries at that, in each type, and just add performance enhancing perks like Keep Away, Perpetual Motion, or the slide perks.