You mean JUST the mount-portion of the Atlas bipod?
If so, I have honestly NEVER seen one for sale before. You might contact Kasey here on the Hide or otherwise Accu-Shot directly by phone or e-mail and see if they can sell you one. If you have a BT10-NC and are just looking for a mount, go ahead and opt for any number of different QD options. Makes moving the bipod on/off different rifles a WHOLE lot easier/simpler as no tools are required.
If you mean a complete BT10 Atlas...check with Triad, MHSA, or any number of other Hide vendors who'll likely have inventory.