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No there are currently none available that will fit this model, eventually there will likely be aftermarket options available, but the ones designed to work with genuine HKs will not work with the CIA version.

Nicholas, it is supposed to be an MP5 Clone and has been offered with MP5 Braces attached : https://www.blackrosefirearms.com/century-arms-ap5-mp5-clone-w-telescopic-arm-brace-9mm -- Y0u may want to ask Century Arms at Phone Number: 561-908-7993

James is correct, my bad, looks like all the HK stock, braces, accessories will fit. https://youtu.be/seASuTOYRS0