Features High quality CNC finished cast aluminum receiver w/ licensed Colt rollmarks EMG Daniel Defense-licensed Mk18 RIS II handguard Tokyo Marui ZET System w/ improved gas efficiency and durability Licensed Colt trademarks Removable flip up front and rear iron sights Realistic recoil and weapon function Authentic Cerakote firearm finish Distinct four-prong flash hider design Unlike Tokyo Marui Airsoft guns of the past, the M4A1 MWS (ZET System) rifles now feature metal receivers instead of all polymer as well as fully licensed trademarks to add to the realism of these replicas. Combined with Tokyo Marui's high quality internals and stock dependability, these rifles are great to skirmish out of the box or as a base for high performance projects.The new ZET System is Tokyo Marui's latest entry into the GBB rifle market featuring an action similar to the venerable Hi-Capa design as opposed to standard gas M4 systems. The ZET System has been designed to not only be much more gas efficient, but it has been designed with durability and longevity in mind thanks in part to its short travel roller style hammer; this hammer design greatly reduces the cyclic wear on your bolt, hammer, and valve knocker. Additional improvements include a steel bolt locking plate which addresses a common issue with standard gas M4 systems where the bolt stop suffers from accelerated wear and quickly loses the last round bolt locking function. Manufacturer: Tokyo Marui FPS Range: 310-320 Specifications: Length: 625mm - 710mm AdjustableWeight: TBAInner Barrel: ~260mmMagazine Capacity: 35rds (Tokyo Marui ZET Magazines)Muzzle Velocity: 310~320 FPS (Measured with 0.20g BBs and Green Gas)Thread Direction: 14mm NegativeGas Type: HFC134a / Green GasFire Modes: Semi/Full-Auto, SafetyPackage Includes: Gun, Magazine, Picatinny Sling Mount, Back Up Iron SightsHopup: Yes, Adjustable