It's the TTK. Against the majority of players, it's time to kill is one of the slowest in the game on primary weapons in both the optimal and maximum shots to kill. It does FEEL good to use though. High damage per shot, really high range, great stability when perks are active, REALLY high aim assist, and massive ammo reserve on top of perks that make it more ammo efficient then normal. But it's slow to kill is what's... well killing it's popularity. The weapon is trapped in an archetype that is just not competitive at the moment. A sure fix would be to increase the damage to ensure two tap kill on double critical. However that alone would make it overpowered, so lowering the rate of fire would also be necessary. I used to use it frequently in PvE because of it's stupid high damage and that it's great with ammo. But recently I've gotten a Lingering Song with Hammer Forged, Triple Tap and High Calibur rounds... so I haven't touched it since. Was kind of hoping for one with explosive rounds and rifle barrel.. but beggers can't be choosers.