skru,
I currently have running a 3300Mah
http://www.zerooneairsoft.co.uk/erol/erol.html
r.e the weapon itself its performed better then i expected, one oif the best AEG's ive ever owned. Bought mine when it first came out and never regreted it.
but still from what ive heard its been hit and miss, some bods have had problems and some haven't.
Weight and looks (minus a few minor details only spotted by the trained eye) are spot on to the real deal.
still even if it did perform bad i would have bought it for sentimental reasons.
overall YOU MUST buy this weapon.