The G36 is a gas operated 5.56x45mm Assault Carbine made by Heckler and Kock (H&K) to replace the G3 7.62x51mm Assault Rifle.
The 'K' (kurz "short") designation of this variant suggests this is a carbine, however this naming is incorrect as the in-game weapon is a full length G36 assault rifle.
The scope on this weapon has an alternate iron sights on top of it. This can be activated by press numpad / (default)
It also has a working flashlight.
RIS - Rail Integration System
Spectre - Variable zoom scope
Desert - Desert camo