Kythera SA Main Sear Switchboards It is not compatible with

It is not compatible with variants of the V2 gearbox which use a snap-action/microswitch trigger such as in the Ares V2 gearboxes

the inserts have more uses than just being paired with one of these stocks

This trigger mount is compatible with all generations of the V2 Fusion Engine from the very original to current production

allowing the engine to mount directly to the hop-up itself

5/3000 and 13/3000 HPA tanks

Kythera SA Main Sear Switchboards It is not compatible withYou want to try doing a fancy trigger job but don't want to take a chance of messing up your only sear? Pick up a spare! Original main sear used with all Kythera SA models. 4140 steel, gas nitride case hardened.