I did notice the pistol was shooting a bit low for me but that can be easily corrected by adjusting the the internal hop-up to raise the shot placement up as required

and 45° offset Picatinny spec mounting ring

and the CO2 capsule is housed in the grip

Up to 115 fps

5 mm steel BBsAmmo Capacity: 17 roundsFPS: 320

G&G GR16 M4/16 120RD Polymer MIDCAP – BLACK AIRSOFT RIFLES I did notice the pistolG&G 120rd Polymer Mid cap Magazine for M4 M16 Series Airsoft AEG Rifles Black Features: Made from High Strength Nylon Reinforced Polymer High Tension Spring Quality Fit and Finish Color: Black Capacity: 120rds Compatibility: Works best with G&G brand AEGs and fits any standard Marui style M4 AEG. Manufacturer: G&G