This is a custom, aluminum, precision machined adapter plate to mount a

Holosun HS407K / 507K X2 to a Ruger Mark I, II, III or IV existing dovetail.

No machining required. Includes a 6-32 stainless steel set screw.

Red dot mounting threads are M4 x 0.7

This adapter plate provides the lowest mounting height possible

and also allows the use of standard holsters with a small modification.

The Ruger Mark IV has  had a very consistent dimensional dovetail.

Fitting instructions for the Ruger are included for the buyer.

Actual pictures of mount - With 30 day Warranty

Price $89.00