Ares Tavor 21 replacement parts

[Lights Out]

Does anyone know where to get replacement parts for my ares Tavor 21? I've got a broken piston.
If you know where I can find parts or what I could use for a compatible replacement that would be much appreciated.

[SF_Chewy]

Use any non-reinforced piston. The reinforced piston have a small lip which hold the teeth in place, those will not work with the gearbox because it interferes with cycling ability.

The following internal parts are proprietary: cylinder head, trigger switch, spring guide, tappet plate, hop up assembly.