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.
Good gun, handles well, feels nice and sterdy, great in two tone, just what you expect from a lower priced air soft gun however disappointing that it doesn't come with a standard battery and charger like alot of other guns