IDZ full name is Infanterist der Zukunft (English: "Infantryman of the future"). It is German Arms upgrades plan. 
This upgrades plan is include the all equipment (e.g. gun , sight ,etc). 

It is another variant of the standard MK36 rifle developed from the K (Kurz) model. “C” means “Compact”
and has the shortest barrel in MK36 series. Also the handguard and rear stock were also shortened and replace 
the top rail handle with iron sights instead of the standard fixed carry handle with optics. It mainly used by 
special forces, law enforcement and PMC.
 
Features:
Open Bolt System
Hard Kick Blowback System
Funtional Bolt Lock/Release like a real steel
Adjustable hopup
Ambidextrous safety (firing selector) & magazine catch
Retractable and foldable stock
Flat top accessory rail integrated with carry handle & iron sights
Dessemable (Strip Down) like a real steel
280mm Outer Barrel With 70mm Flash Hider
 
Specifications:
Length: 630 (Folded) / 880mm
Barrel Length: ~340mm
Shooting Mode: Safety, Semi-Auto & Full-Auto
Weight (g): 2815
System: WE Open Bolt GBB System.
Color: Black
Magazine Capacity: 30 rds
Material: Polymer & Metal
Bullet type: 6mm BB
Power (Muzzle Velocity): 390 FPS
Manufacturer: WE