Yes, as long as it is Auto-cocker threaded, any barrel will fit.
The threads are autococker threads. All proto and dye guns have autococker threads.
The proto slg is very accurate even with the stock barrel
You should use HPA with a Proto SLG.
Proto SLG all the way. Stay away from the spyders.
Yes.
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.
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