When they were 150s they were better than 140s in that they were Lightweight and had a higher rate of fire, but now they're just worse in every way than the original 140s. I mean, look at Thorn, it starts damage falloff at 30m, which is terrible in this meta, while Ace can reach over 36.
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Comparing ace to thorn is kind of silly. Ace of spades is literally the highest ranged handcannon in the game that's still obtainable for 140s. That's like comparing arc logic to gnawing hunger.