A Proline 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.
Metal hop-up chamber
Spring guide with ball bearing
8mm double bushings
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
Functional bolt catch release
LMT sopmod stock
Raised rail brings up the optical sights better when wearing a mask.
350 high cap metal magazine
Metal body, stock tube barrel, front sight and rails
Mag. Capacity:350 rounds
Hop Up Type:Adjustable