CNC aluminium device which fills the space around the HopUp chamber. Holds weak front part of the gearbox and prevents breakage. Also keeps gearbox in position and allows to continue playing. Improved design allows you to use on the most common M4 AEG brands, such as AimTop, Matrix, Classic Army, Dboys, A&K, SRC, P&J, A.P.S, G&P. Not suitable for two piece hopup chambers.
GEARBOX REINFORCEMENT - MBLOCK - GEN.2