Replace the Wilson Combat 47D 1911 magazine base plate with a rail adapter so you can attach the MantisX to your 1911.  

Preferred if you don't have light-accommodating holster and want to train with holster draws, or if you don't have a rail.

Available in both 9mm and .45 (select the appropriate option).

Part numbers: MT-2014 (9mm) and MT-2015 (.45).