The difference in size of bearings means they can fit in larger ball bearings for more reliable performance and less resistance. Also it spreads the force across a larger area (circumference of a 6mm hole compared to that of an 8mm hole) so there is less of a chance of the shell cracking in between the holes. The prowin mechbox provides quick spring change abilities, far stronger design so can take stronger springs without breaking, integrated hopup unit for much improved air seal, and a couple other perks. My guess is he has a turbo motor, highspeed gears, bearing bushings, and a huge battery to get that ROF.
As for the showering with BB's at range I have never run into that problem. If you can't hit a target you can't hit it. The longest range kills I have seen are with either semi or short 2-4rnd bursts (sniper rifles excluded.) I have seen people try to shower a target and the BB's still fall short or they have to arc it so much the BB's are almost falling from straight above the person so they don't call it (feels like someone shooting into a tree above you and the BB's fall down on you.) As for CQB I have made more kills and been killed more times by semi than by auto, even low ROF guns. I have had people fire bursts from insane high ROF guns in CQB and still miss. More volume of ammo only applies if you have a cone of fire spraying an area, pretty much everyone who upgrades their gun with super high ROF also installs a tightbore so their grouping is the same regardless of ROF, a miss is still a miss no matter how many BB's are in that small area. Now if someone put in a loose bore (find a 6.10mm barrel or something) and super high ROF just to get massive spread specifically for CQB, yeah, that would suck, but no one does that. Personally I'm more against hicaps than super high ROF but I'm not even that much against hicaps.
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