Had this gun for almost 2 years now. Sturdy as a rock. Great ROF out of the box.
Upgrades that I did (and turned out well):
-Madbull barrel (extended)
-King Arms silencer
-Wired to rear (9.6 V 4200 mah in a battery bag screwed to the stock)
-PDI 170% spring
-Matrix Magnum motor
Now it shoots 390 with a ridiculous ROF. =)
Good take on the MP5 - looks different than anything else out there.
Solid, good base for upgrades.
Scope mount included
Took a long time to wire to rear
Plastic hop up unit
Rating: [5 of 5 Stars!]