This is the new Heckler & Koch 416 GBB. The long gun is made of metal.

Details:
Model: Heckler & Koch 416 GBB
Caliber: 6 mm BB
Power Source: gas
Magazine: 35 shots
Energy: 1,6 Joules
Overall Length: 810 - 900 mm
Weight: 3100 g
Trigger: Single Action
Special feature(s) Blowback; full metal; adjustable sight
Age:free from 18 years, proof of age required