A Sportline Armalite M4 with the massive looking yet remarkable lightweight S.I.R. system fully licensed by A.R.M.S. Made famous by US special forces, the S.I.R. system was one of the very first free float rail systems that allows a customized set-up of tactical accessories.
On this Airsoft gun the SIR (Selective Integrated Rail) allows super easy access to the battery compartment in the front.
Chrome mock gas tube
Rear ARMS flip up sight contoured to fit rail system
Easy battery compartment access
Front grip included
Removable side rail sections
M4 flex stock
Raised rail brings up the optical sights better when wearing a mask.
350 high cap metal magazine
Metal barrel and stock tube
Hop Up Type:Adjustable