Can I thread my barrel for a suppressor?

Can you get your barrel threaded for a suppressor? Maybe. This video will give you a good idea if it's possible or not. It helps to have a caliper to measure your barrel diameter with. FYI, 0.625" = 5/8".
Most 30 caliber and .338 suppressors expect a 5/8-24 barrel thread. That's 0.625" (or 5/8") outside diameter, and 24 threads per inch.

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Thank you