Reinforced metal gearbox (Version II) For MP5/M16/G3 Series AEGs.

Classic Army's Version 2, 7mm Type gearbox differs from other standard 6mm gearboxes in that the bushing holes are larger. These gearboxes are primarily designed for high-speed use in MP5's, however can also fit all MP5 (Except MP5K and PDW), M16, and G3 Series airsoft rifles.

Replacement upper gearbox shell for ICS CAR-97/PCR-79 M16/M4 style airsoft guns.  Acts as a replacement or spare upper receive for your rifle.  Note:  ONLY compatible with ICS CAR-97/PCR-79 airsoft rifle.  NOT compatible with standard Version 2 gearboxes from other manufacturers such as Tokyo Marui, Classic Army, SRC and other.

The ICS Olympic Arms M120 Power Up Kit is a bore-up kit for your ICS M4 and M16 style airsoft rifles.  This kit includes everything you need to built an upgraded upper for your ICS rifle.  It contains the upper gearbox (MA34), an M120 spring (MC39), metal spring guide (MA46), tappet plate & spring (MA50), bolt (MP23), oversized piston head (MC56), aluminum piston (MC05), oversize 4-port cylinder (MC58).

Systema Complete Mech-Box for G3 type airsoft rifles. This gearbox set comes with the Systema M100 spring and is tuned for high-speed applications. Completely replaces your exsisting gearbox.

Systema Complete Mech-Box for G3 type airsoft rifles. This gearbox set comes with the Systema M120 spring and Systema Torque-Up Gears installed and tuned.

Systema Complete Mech-Box for G3 type airsoft rifles. This gearbox set comes with the Systema M150 spring and Systema Super Torque-Up Gears installed and tuned.

Systema Complete Mech-Box for M4, M4 RIS and S-System type airsoft rifles. This gearbox set comes with the Systema M100 spring and is tuned for high-speed applications.

Systema Complete Mech-Box for M4, M4 RIS and S-System type airsoft rifles. This gearbox set comes with the Systema M120 spring and Systema Torque-Up Gears installed and tuned.