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More catches on the bevel gear won't affect too much, but it means that there will be less backwards movement if you take your finger off the trigger in the middle of a cycle. It'll need a regular piston, from the looks of the sector gear.
The different "powered" sets are probably just different ratios. It's like the Systema regular, torque up and super torque up sets.
Arnie's has a good writeup on this set, it's pretty recent, just go back in the news archive.
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