1. hot swap, rodeo, or snapshot, fitted stock, rifled barrel.
2. crowd control, focused fire, or snapshot, fitted stock, braced frame.
3. partial refund, counterbalance, or single point sling, speed reload, rifled barrel.
4. partial refund, glass half full, or snapshot, speed reload, braced frame
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The two things you want on any auto are stability and range. #1 gives you stability and range boost (fitted stock/rifled barrel) #2 gives you all stability and no range boost. Focused fire hasn't panned out as a great perk. #3 is a split. Counter balance helps and rifled barrel effectively doubles the range. I would lean towards 1 or 3. Stability and the ability to engage at range is more important. Always aim center mass because the recoil will make the shots rise up for long periods of shooting. Hope that helps.