The King Arms 9MM Reinforce Gearbox for M16/M4 is the best way to upgrade your gearbox if you are shooting high fps, 450+. The purpose of the 8mm ball bearings is to reduce the friction put on the gears fulcrum while spinning. Don't make the mistake of thinking the only way your gears can break is at the teeth. High power springs with mediocre bushings or bearings can break the gears at the stem. A break at the stem is potentially more dangerous to the gearbox than just a few teeth breaking off. The King Arms 9mm Reinforced Gearbox is designed to prevent damage to the gears and to prevent gearbox failure due to high stress. If you like your high powered gun performing in tip top condition you need this reinforced gearbox.
Manufacturer: King Arms
Material: Reinforced Zinc Alloy
Design: Version 2 M16/M4 AEG
One (1) Gearbox Shell, One (1) Selector Plate, Six (6) Bearings
2013-01-18 18:40:14 N. FANNING verified buyer
For: King Arms 9MM Reinforced AEG Gearbox for M16/M4
This is the best gearbox I've had so far. Give you some info on what its got in side it for the abuse Systema bore up cylinder, Systema energy torque up gears, JBU aluminum piston, Systema m150 spring. Powering this box is a 10.8v battery and Systema magnum long motor. ROF 25 FPS 600
Got 25,000-30,000 bb's through it. ABUSE it can handle had it going on 3 yrs now. Just took gun apart after 3 yrs of use to inspect the gearbox and still no signs of wear or stress looks like I just took it out of the box. I will buy this box again!!!!!!
price is a very good
Bearing don't fit in gearbox as tight as I would like
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