SiegeTek make the strongest AEG gears on the planet. 

This is the latest generation (Gen 4) of Chromoly gears from their factory, case hardened for extreme durability. 
This full set comes with the Sector, Spur and Bevel gears.
The Sector features an enhanced cutoff cam for snappier cutoff lever activation (and fewer semi-auto lockups) and is compatible with all mechanical and optical cycle detection systems. 
The enlarged tappet cam allows for optimal feeding at all rates of fire without the need for an additional delayer chip.

The Spur is as solid as ever and will work with most standard ratio sectors and bevels. 
The Bevel gear now comes with an enhanced anti-rotation ring with a higher number of steps for the ARL to catch on as well as smoother tooth geometry for quieter operation.
 

Fully CNC machined and expertly finished, these gears will last for years to come in virtually any setup you could build. 
For absolute strength and reliability, nothing else compares. 

SiegeTek Torque Gear Set for Elongated Gearboxes (19T 26.67:1)

SKU: GS-T-E
£149.99Price
  • These gears are a matched set and should not be mixed with other gears. 

    This set is for elongated V2.5 gearboxes with 19-tooth pistons only. 
    Not compatible with the G&G L85 or TM PSG-1
    Not compatible with 14:1, 13:1 or 10:1 gears. 

    We recommend a thin coating of Superlube PTFE grease applied with a toothbrush. 

    When short-stroking, we recommend removing teeth from the pickup side first and then the release side in a ratio of 2:1.