Manufacturer: Classic Army Model: Classic Army M4 SBR PDW Airsoft Gun w/ ECS BB Velocity: 330-350 FPS w/ .20g Fore-end: 5" Rail, HD Polymer Receiver: HD Polymer Fire Option: Semi / Full Auto HopUp: Adjustable Outer Barrel: Metal Outer Barrel Inner Barrel: 155mm 6.03 Tight Bore Gearbox: Full Metal Gearbox Gearset: Full Metal Wire Cut, 18:1 Bushing: 9mm Bushing Mosfet: Yes Magazine Capacity: 300R Lipo Ready: Yes Weight: 5lbs Heat tolerant inline mosfet Programmable ECS system Quick Change Spring Ready Received in a Mystery Box, have no use for it. Test fired to ensure it's problem free. Gun is like new, ships with original box/packaging.