I don't have any real world experience, however I love my single point on my BD44. OST has been out of stock for UDC adapters for a while so I can't outfit my AR or Vz carbine to work with it.
I don't believe the VTAC 2 point will work on the BD44 without adapters or modification to the rifle.
I don't believe the VTAC 2 point will work on the BD44 without adapters or modification to the rifle.