Not to be confused with the Heckler & Koch G36.
The Heckler & Koch HK36 is an experimental assault rifle.
Very little is known about the HK36's history, except that it was an experimental rifle.
The HK36 uses roller-delayed blowback to fire its rounds, which has been used in most of Heckler & Koch's delayed blowback weapons; it also had a G36-style charging handle mounted above the foreend. It had a 4-setting fire selector, with 0 for safe, 1 for semi-automatic, 25 or 30 for full-auto, and 3 for controlled burst fire. A very peculiar part of the rifle was the magazine; there were some variants with a regular box magazine and others with an integral magazine. The integral magazine of the HK36 was fed by a disposable box which held 30 rounds. The top and bottom of the box was open, with the bottom closed with tape, so that the magazine follower could push the rounds up when firing. The box was loaded through a hatch on the left side of the rifle, which was opened by a lever on the bottom. It used an experimental 4.6x35mm round, which was designed by CETME; it reduced recoil of the gun, but it lost its velocity very quickly. While it was never accepted for military service, the rifle gave Heckler & Koch some interesting firearm designs for the future, such as the MP7 and the G36.
This was the first variant of the rifle. It used a box magazine.
This was the second variant of the rifle. It used an interesting integral magazine fed by a disposable box.