Barrels:

The GT Commando series are compatible with Spyder threads.

The Diamond GT series are compatible with AutoCocker.

We do strongly recommend  you try the barrel out first before purchasing. The barrel manufacturer should have more detailed information on which marker is compatible with their barrel.

Electronic Grips:

Neither the Diamond GT series or GT Commando series is currently compatible with electronic trigger/grip assemblies.

Nitrogen systems:

Both the GT Commando series and the Diamond GT series are compatible with nitrogen systems.