Specna Arms CORE Series M4 AEG (Model: M4 RIS / Black)

Ultra lightweight fiberglass reinforced polymer receiver
Licensed Rock River Arms logos
Nylon fiber furniture
Metal barrel assembly, flash hider, charging handle, and sling swivels
ESA quick spring change system allows the spring to be changed without the need to disassemble your gun
Rotary type hopup with 6.03mm tight bore barrel
380 fps spring pre-installed from factory, optional 310fps (M90) spring included to reduce muzzle velocity
Quad rail handguard