Posted at their Facebook Page, Salient Arms International announce this pistol design done with Chris Costa of Costa Ludus and those who want to use the Trijicon RMR can have the recessed cut as an option... "In direct collaboration with Chris Costa, Salient Arms International has developed an exclusive configuration called 'LUDUS' based off of what Mr. Costa wanted most in his hand gun of choice. We are happy with the results!

(Note all LUDUS' directly from Salient will be configured thusly: Glock 17/19 exclusive slide with full-wrap front serrations coated in LUDUS gray, and Salient Flat-Faced trigger. Recessed RMR Cut/Sight and DLC coated box-flute/matched-fit barrel are further options. Customers can supply any Glock model number to have this package done.)"