Per the pictures released by CZ-USA today, we have worked in collaboration with SB Tactical over the past several months to develop a Slider Arm Brace. I was unable to answer your question before as I could not discuss this project until the photo was released today- sorry for the delay, but I thought the info that we have our own Slider Arm Brace was pertinent to the question.
The buttplate of our slider stock is retained by two roll pins, one in each strut. You can in theory remove them and attached whatever you want in place of an arm brace, but we have no plans to offer adapters for other types of arm braces- anything arm brace related would either be our own design or in conjunction with SB Tactical.
We only sell complete Slider Stocks, and don't have any extra pieces to part them out, sorry.
I hope that answers your question!
Sven
Manticore Arms