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Hi Casey and welcome. The Royal has a 16" Barrel with muzzle threaded 1/2x20 (a European standard). Cheers and stay safe!

It's European 1/2x20. There are plenty of 1/2x20 to 1/2x28 adapters available. If you found this information helpful, please select it as Best Answer. Thank you.

Hi Casey, this is threaded 1/2×20 (a European standard). Stay safe & have a great day!