UPDATED DESIGN
M-TDC top RIS TWIN SCREW kit includes:
1 Rail incorporating TWIN SCREW ADJUSTMENT SLOT
1 adaptor plate TWIN SCREW
2 grub screws
1 Allen bolt
 
This kit does not contain the red-dot sight, or the M-TDC chassis itself.
 
An M-TDC Chassis is required for this kit to function on the MK23. Please note that this kit will prevent slide action whilst fitted.