Guarder SP120 Full Tune-Up Kit for Marui MC51/G3SAS BioHazard Open Top is designed to

Open Top is designed to hold four MP7 40 round magazines with an adjustable shock cord retention system

Hopup Gel made by 70° Silicone Gel

M433 HEDP type cartridge version II for grenade launcher  Constructed of reinforced metal alloy  Fit all 40mm Launcher: STAR

System: Spring Pump action

Guarder SP120 Full Tune-Up Kit for Marui MC51/G3SAS BioHazard Open Top is designed toA complete kit includes ALL parts for upgrading your Airsoft Electric Gun AEG Guarder made this kit with all suitable parts to super tune up your AEG Rifle The combination of difference parts allow an optimal result & performance Hard and rigid material used, including S303 Stainless Steel, Brass, Polycarbonate, Aluminum, Acetal and Steel As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed