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Yes this is threaded. This has a 40 threads per inch which is proprietary. You will need a thread adapter kit (Delta P Design SOCOM Muzzle Thread Adapter Kit) to be able to use standard suppressors, brakes.

Yes, it is threaded.

Edward the barrel is threaded

Looks like this is your only option.
"Delta P Design SOCOM Muzzle Thread Adapter Kit, which allows you to use any flash suppressor, muzzle brake or even direct-thread suppressors. It replaces the standard cylinder lock with one that has 5/8×24 threads. It uses the factory front sight and installs easily without any special tools."