Yes the Halo will work perfectly with a Nexus Cocker ! And the other post is correct you MUST use Ball Anti Double Balls, The Eclipse fangz ones don't work with the Halo B becuase they are force fed.
...But no for long...being that HALO's dont work for very long with any marker!!
F1 car...works great at high speed for a limited time...then its rebuild time!!!