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The Angel Silent Head Set in a gun with an inner barrel that long may experience lower than expected velocity. The dampening system on the piston head takes up some of the volume in the cylinder that is required to get maximum capacity through the 590mm inner barrel.
And you're correct, once you go up to 650mm, you'll need the bore up kit as well as an M120 or stronger spring.
The head set that comes with a bore up kit is a Systema-type silent head set. As anyone can tell you, it's not really "silent."
The "zinc alloy" gearboxes you refer to are zinc-aluminum... which should be the same thing as the King Arms one. It's just crafty marketing terms, but generally, if it's a die-casted part, then it's zinc-alloy. It's easier to pour in to the moulds. As far as I know, pure aluminum version 3 gearboxes do not exist.
6mm ball bearings will NOT withstand anything much beyond an M100 spring. If you're lucky, it can handle heavy springs, but it will wear down much faster than if you increased the size to 7mm. I personally do not recommend taking that risk. If you MUST go with ball bearings, increase to 7mm bearings which can safely handle up to PDI 190% equivalent springs. Or you could just stick with a 6mm gearbox and use standard bushings which could handle a 550fps spring if you wanted to go that nuts...
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