KWA RN-15 front set & upper metal body for M4 electric gun

New custom front set with metal upper receiver
outer barrel with 15 inches KEYMOD rail and SD muzzle end
upper body with forward knob and port cover
precision inner barrel with hop chamber and packing
ready to use part for KWA M4 RONIN/ERG/SR10 rifle series only

-Total length: 590mm
-Inner barrel: 381mm
-Outer barrel: 419mm