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Might give Paladin Machine in SC a call, they can make AR bbls from blanks, the CMMG 9x19mm bbl extension is a standard AR bbl extension, I believe.
@amphibian
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As mentioned no my website:
https://www.c3junkie.com I have two custom CMMG RDB barrels. My 9mm barrel was done by Deadshot barrels and my .45ACP barrel was done by @Madmachinist (Macon Armory).
In both cases, I sent them a stainless straight blowback barrel and a barrel extension and they turned them into CMMG RDB barrels.
For the 9mm barrel, I sent a .40SW RDB bolt instead of 9mm and had him headspace to that bolt instead of 9mm to increase the delay but warning if you do that, you must use a custom fixed ejector if you do that as it will have such a soft recoil impulse that the spring loaded ejector won't kick the brass out.