Looks like an MP5 (Ish)
Comfy Check rest
Nice front grip
Doesn't use too many pieces, well, at least to you it doesn't :3
Has a nice weight
Not too big
Mostly hollow body
MORE INFO: All credit is to this ---> http://www.hk-usa.com/military_products/mp5_general.asp
First developed in the mid-1960s, the 9 mm Heckler & Koch MP5 submachine gun uses the same delayed blowback operating system found on the famous HK G3 automatic rifle. Reliability, accuracy, ease of handling, simple maintenance, and safety—all the elements of HK excellence are highlighted on the MP5. Firing from the closed-bolt position in all modes of fire make MP5 submachine guns extremely accurate and controllable.
Continual product improvements over more than 40 years of production have kept the MP5 up-to-date and technologically current; it is firmly established as the world’s pre-eminent submachine gun among military and law enforcement users.
Over 120 MP5 variants are available to address the widest range of tactical requirements. A selection of optional trigger groups allow for single fire only, full automatic, 2-round, and 3-round burst options. The weapon’s unique modular design and a variety of optional buttstocks, forearms, sight mounts, and other accessories gives the MP5 extraordinary flexibility to meet most any mission requirement.