Arsenal Overhaul Redux is a compilation of mods designed to improve gameplay of Clear Sky.
Also known as the Fallschirmjagergewehr 42, was a selective-fire battle rifle used by the German paratroopers during World War II. Designed in the early 1940s, this innovative rifle combined the features of a light machine gun and a rifle, providing soldiers with a versatile weapon for various combat situations. A very rare weapon, sometimes you can buy one in the black market.
Model source: Moddb.com
Adaptation to my mod: PYP
Here a video demonstration: