1. Yes its the same thing as the pro-classic, different body
2. same gun with a mildly different body
3. Exact same gun, little more weight. You can get a vert ASA for the pro-classic for fifteen dollars
4. depends on the gun, but the MM and pro classic use a special twistlock style barrel. It basicaly has part of the breach attached to it. ULE bodies have cocker threads.
5. yes
6. there are lots of aftermarket double trigger frames, the benchmark is probably the cheapest you goign to find. You could also vut the guard off and stick a double trigger on.
Mini Mag= 239.99. If you pay that much for a minimag, walk out and slpa yourself
Pro Classic Mage= 199.99 not the greatest deal, but not bad.
USed automags run around 100 bucks man. Thos two guns are identical except in body shape. Pick the one you want, or look around automags dot org and see what you wnat

. My ersonal recomendation is to look around here and on AO and see if you cant find one with some of the ULE upgrades, or maybe even a fairly stock Xvalved gun(unless you dont want to get HPA, then look for a nice classic valved gun)