The CA VT nut cap threads into the fine threads on any Nordic MXT barrel nut. It is internally threaded 9/16x18 for GroveTec QD sling cups. This is provided standard on the 4 and 8 round VersaTubes. Barrel nut and QD cups not included.
We recomend using a quickset epoxy to install a QD cup into the cap. If you prefer Locktite, you must use a primer or remove the anodizing on the nut and the black oxide on the QD cup.
We will be adding the Grovtec cups and other accessories for the system in the future.