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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Those converted 150s have better handling, recoil, stability and aim assist than Ace. Fair trade off I would say.