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This is an FTN.3 Rimfire that uses 3/4 NPT threads. There is also a detached section of the tube that is just the threads, for importing into your own designs.
There are plenty of 3/4 NPT adapters to 1/2-28 or 5/8-24 adapters on ebay. I've found one supplier for 13/16-16 to 3/4 NPT, which interfaces with the threads on the Breek Arms muzzle devices. There are other brands of muzzle devices with this thread, so you can look around for what fits your needs.
13/16-16 to 3/4 NPT Thread Adapter
https://www.infiniteproductsolutions.com/muzzle-upgrades/reduce-recoil/infinite-adapter-muzzle-brakes/13-16-16-muzzle-device-thread-adapters/13-16-16-to-3-4-npt-thread-adapter/
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