Replace the Ruger Security, SR, and American 10rd magazine base plate with a rail adapter so you can attach the MantisX to your Ruger. Preferred if you don't have light-accommodating holster and want to train with holster draws, or if the firearm doesn't have a rail. Compatible with: Security 9/40 10rd, SR 9/40 10rd, and American 9mm 10rd Part number: MT-2045