SHS AEG Gear Set -  These gears are a phenominal value. They are very strong gears, easily capable of pushing your muzzle velocity over 500 FPS.  The teeth are helical cut, so proper shimming is a must.  We also recommend solid steel bushings due to the axial forces generated in helical gear setups. If you're looking to build your Version 2 or Version 3 compatible gun into a DMR, but don't want to break the bank, grab a set of these!