Complete, reinforced gearbox in version v.2 dedicated to the M4 / M16 type replicas. It is an ideal solution for people who want to buy a good quality gearbox at a reasonable price.

The skeleton has been adapted to 8mm slide and ball bearings, and thanks to the structure reinforced in critical places, stronger springs can also be used. The gearbox has a quick spring change system compatible with Speca Arms replicas of the CORE and ONE series.

The Enter & Convert ™ system allows for quick and efficient adjustment of the replica's power to the conditions expected in the field of airsoft combat, without the need to disassemble the entire gearbox, and thus have access to a workshop or a number of specialized tools. After removing the gearbox from the replica's body, the replacement process itself takes just a few seconds - the spring and the guide are pulled out through the hole in the back wall of the skeleton.

Inside there are, among others: reinforced steel gears 18; 1, M110 spring, light polymer piston with a full steel strip, aluminum, bearing and sealed piston head, aluminum cylinder head with a soft dumper, aluminum, chrome type 0 cylinder, polymer sealed nozzle and metal, ball-bearing spring guide. The mentioned configuration, depending on the replica, generates an average muzzle velocity in the range of 400-420 FPS.

A characteristic feature of this frame is the adaptation to the electronic contact included in the kit, which watches over the gearbox operation, significantly improves the trigger response and improves the life of LiPo batteries.

Rear-wired version.