Hi, Im looking at these two guns. One is $35 less, but has a type 3 gearbox, the othere is $35 more but has Type 2 gearbox. What is the difference between the versions gearboxes? (I really dont know anything about this) And is one of these guns better for the money? Double Eagles M89P UMG Ver. 2 AEG Airsoft Gun by: Double Eagles - JG M4A1 Airsoft Gun ( Basic Version ) by: JG - Airsoft GI - Welcome to Im trying to help my bro-in-law get a gun and these are the two we are looking at. THanks guys!