WELL Electric AEG Full Auto RIS M4 FPS-300 Rifle Collapsible Stock Airsoft Gun Metal GEARS Electric Powered Metal Gears Fully Automatic - Semi Automatic Velocity (FPS): 300 w/ .20G BB's Magazine BB Capacity: 500 Rounds Collapsible Stock Removable Front Aiming Sight Rail Interface System (RIS) for Additional Accessories Adjustable Hop Up System Adjustable Rear Aiming Sight and Removable Functional Safety Length: 25 Inches (Collapsed Stock) Length: 27.5 Inches (Stock Extended)