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Hi Michael, each barrel is threaded 1/2 x 28 Stay safe & have a great day!

Hi Michael and welcome. This The 5.56 is threaded 1/2 x 28 and the 300BLK is threaded 5/8x24 tpi. Cheers and stay safe!

Threaded.

According to the DB web site, both barrels are threaded 1/2 x 28 >>> https://diamondbackfirearms.com/portfolio/db1921k001/