The G&G Umarex EBB is the best MP5 out there. Myself and a friend both use it and we get nothing but amazed faces and comments by our teammates and foes on the field. I have yet to see a better airsoft gun with own eyes. It shoots straight as an arrow with a very high rate of fire. It is very loud with a Sound Hog, so if you're going for stealth you will want to disable the electric blowback. Disassembly is child's play.
There's 3 versions. Fixed, Foldable and Retractable stock
http://www.torontoairsoft.com/UMAREX...GG_p_1455.html
Evike review
Airsoft Evike.com- Umarex licensed H&K Mp5 A5 (EBB) manufactured by G&G - YouTube