I am also interested in having my barrel threaded for a supressor, but I am not familiar with Adco. Are they located in Maryland? I googled but there is more than one company with a similar name.
This is the company you want.
https://www.adcofirearms.com/shopservices/shop_qnew.cfm?code=Barrel%20Threading
No they are not located in MD. You do everything by mail.
Always check your local gunsmith first, but it's hard to beat ADCOs lead time
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