You should use HPA with a Proto SLG.
Proto SLG all the way. Stay away from the spyders.
Yes.
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The threads are autococker threads. All proto and dye guns have autococker threads.
If you are thinking about getting a better gun because you have been playing for a while (which is what i am guessing) then go with the proto slg and sell the vibe. The proto slg is a good gun for the price and has all the modes you would need on it and is pretty accurate. Another good gun that is around the price is the azodin blitz. It is a good cheap gun that i have been playing with for about a year and 4 months and it has not failed me yet.
Yes, as long as it is Auto-cocker threaded, any barrel will fit.
Sadly no. The Ultralight board will only work on the Ultralight frame. If you are looking for a good board though, maybe look into virtue boards.
Although both is decent for the price, the SLG is better. If you have money for the SLG, go for it, otherwise the Piranha GTI is good enough.
yes, also has a couple other modes
2 lbs. 2 oz
The proto slg is very accurate even with the stock barrel