Features:
Trigger Safety
Metal Outer Barrel
Accessory rail system
Interchangeable Back-strap
Gas filtration system built-in to the magazine 
Infornmation:
Model:GTP9
Materials: Steel, Zine Alloy, Nylon, Rubber
Length: 226mm
Weight:770g (1.7pounds)
Power Source: Green Gas
Action: Semi
Ammo Type: 6mm airsoft BBs
Ammo Capacity: 22 round magazine
FPS: 300
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:
G&G GTP9 23rd Airsoft Magazine