Out of those, I'd keep #2. Braced Frame is worth the smaller mag size.
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Does focus fire hurt it since low impact isn't as favored?
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Not great. With Pulse Rifles or auto rifles you are looking for range and stability. I have a Righteous VII with perfect balance and Counterbalance and it's a beast. I've also got the Nirwens Mercy with Counterbalance, Braced Frame and Feeding Frenzy, also a beast.