Features:
Full travel bolt system for a realistic hard kick blowback
High strength stamped steel receiver
Ergonomic ribbed polymer handguard
Steel side-folding stock
Integrated steel magazine guard
Improved selector lever
Adjustable front and rear iron sights
Integrated AK74 side optics mount for optional optics attachments
Amazing power, range, grouping, and accuracy
Infornmation:
Model: AKS74U 
Materials: Steel, Zine Alloy, Nylon, Rubber
Length: 500mm / 730mm
Weight:2900g (6.4 pounds)
Power Source: GBB
Action: Semi/Auto
Ammo Type: 6mm airsoft BBs
Ammo Capacity: 30 round magazine
FPS: 400
Bunker Tech Upgrades
Maple leaf gbb 6.02mm Inner Barrel
Maple leaf  High Accuracy Hop-up Bucking- Internal Parts Adjust
All function checks, to avoid common tolerance issues.
BB weight for optimal performance: 0.36 gram 
PS:
40rd Magazine for WE-Tech AK74