There is a CYMA MP5K-PDW in the for sale forum now, I would've love to pick that one up if I don't have a MP5 already.
Full metal, light weight - easy to use - cheap to replace parts with.
Main: KJW 10/22, WE M4 (Open Bolt), ICS SPR
Sniper: MB02, (B. A. Level 2 Cert.)