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Mark, for an accurate answer, I would contact RIA, (775) 537-1444 OR email SUPPORT@ARMSCOR.COM

Mark, We're just customers as yourself not buds employees, so we're most likely looking at the same info online as you are. I doubt buds customer service would be able to assist you either. So unfortunately rock island armorys customer service would be your best option to find out. If they aren't any help the only other option would be to take it to a gunsmith and they'll be able to tell you. Sorry but hope this helps some.

Mark, if you have a digital caliber you could also try measuring your thread pitch size. There's forums online showing how to do so.

I couldn't find anything definitive, but I did find an article at silencer shop that states that CZ and some other European manufacturers use ½x20 thread pitch (this RIA is made in turkey not exactly EU territory but they may have used a European threading) of this is the case you need an adapter, in stock here https://hughesprecision.com/product/12-20tpi-id-barrel-thd-to-12-28tpi-od-thd-adapter-thread-converter/

Mark, Rock Island Armory U.S.A should be able to answer this accurately at Phone: (775) 537-1444 or by email inquiry here : -- SUPPORT@ARMSCOR.COM