This G&G MRE Style Upper Receiver for G4 or Combat Machine M4 Blowback is a terrific accessory for anyone that plays a lot of different types of airsoft. If you primarily play CQB but want to extend your barrel for outdoor play this upper receiver kit is perfect and easy to change. All you would need is a dedicated outer barrel and hop up unit and you can have a mission specific gun in seconds. The MRE type rail allows the shooter to grip their gun further forward than other rail systems, offering more control. Additionally there is more rail space for mounting accessories like laser or lights, with the option of doing so in front of the front sight above the barrel.
Very nice upper receiver...using it on my G4-A3. put the madbull blackside barrel extension on and im gonna put a 509 6.01 barrel in it.
Fits a 363mm barrel with no extension
& sights (back it removeable I believe the front one is too if i rly want it off)
flash hider is removeable
Realism factor because it has a gas rod.
Flash hider is a b**ch and a half to get off.
I had to get a pot of boiling water and dip the flash hider in for 5 minutes. then i got two rubber grippers. (one for the flash hider and one to hold the barrel so i didnt twist it) and a pipe wrench. I had to hulk on the thing to get the glue to break.