E&C SII 8.5 Inch AEG Airsoft Rifle EC-337QD System: With Quick Disassemble System, even beginners can replace the spring in a minimum of 60 seconds. Solid Construction: Built with a full metal upper and lower receiver for enhanced durability and authenticity. Easy Adjustment: Features a mock bolt that locks open, providing easy access for hop up adjustments. Upgradeable Design: Equipped with a metal Version 2. 0 gearbox, our airsoft gun offers easy upgradeability to enhance your gaming

With most exterior parts—like the upper and lower receivers

Brand E&C  Airsoft Model EC-302 Firearm Model M4CQB Material Metal Power Source Electric Speed

Firearm Model HK416 RAHG Material Metal Power Source Electric Speed

Brand E&C  Airsoft Model EC-118

Advanced Gearbox: Level up your gear with E&C’s Gearbox 2

Brand E&C  Airsoft Model EC-203 Firearm Model M110A1 Material Metal Power Source Electric Speed

Applicable to most E&C M4/M16 model AEG products

Brand E&C  Airsoft Model EC-603 Firearm Model MK18 MOD1 Material Metal Power Source Electric Speed

Adjustable Barrel Length  inch Barrel Thread CCW Dimension    L×W×H  ×  ×  cm Gross Weight  kg Net Weight

Material Metal Power Source Electric Speed

Brand E&C  Airsoft Model EC-307 Firearm Model M16A4 Material Metal Power Source Electric Speed

Adjustable Barrel Length 9 inch Barrel Thread CCW Dimension   L×W×H 70 × 11 × 38 cm Gross Weight 4