Yes, as long as it is Auto-cocker threaded, any barrel will fit.
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The threads are autococker threads. All proto and dye guns have autococker threads.
The proto slg is very accurate even with the stock barrel
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.
You should use HPA with a Proto SLG.
Proto SLG all the way. Stay away from the spyders.
Yes.
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.
It can be run on any pressure. Only low end mechanical guns "must" be high pressure, and only certain Angle markers "must" be run on low pressure.
9 volt.
not a spyder e-mr1. the new proto slg 09 with an upgraded barrel.
The rail comes with a two piece barrel and has some slight changes, such as a new Feedneck, ASA (On/Off), Different Bolt, Ultralight Frame, and an aluminum body. The SLG has a bit older parts, and has a type of plastic for the body. This makes the pricing about 200 different between the two.