This paper model is a full size Heckler & Koch G36C Rifle, a compact version based on the Heckler & Koch G36, which a 5.56×45mm assault rifle, the paper model was created by Wong Hidayat. The size of the finished model is 72 x 27,2 cm. The G36C is a further development of the G36K.
It has a shorter barrel than the G36K, and a four-prong open-type flash hider. The extremely short barrel forced designers to move the gas block closer to the muzzle end and reduce the length of the gas piston operating rod. The handguard and stock were also shortened and the fixed carry handle was replaced with a carrying handle with an integrated MIL-STD-1913 Picatinny rail.
The dual optical sight found on the standard G36 and G36K models was replaced with a set of rail-mounted detachable iron sights that consist of a semi-shrouded front post and a flip-up rear sight with two apertures of different diameter. The short handguard has four accessory attachment points, one of which could be used for a vertical grip. [Source: wikipedia]
You can download the papercraft model here: Full Size Heckler & Koch G36C Rifle Free Paper Model Download