I and several of our employees use the GCODE holsters for AIWB carry, Here are some tips in regards to the GCODE's belt clips that have worked for us:
-if wearing a 1.5" belt, the clips will be sloppy with a lot of side to side play as it really was intended for a 1.75" it appears. The following mod I made has done wonders and makes the holster not move AT ALL. Also, the retention is so secure you may find that you will no longer need two clips to securely hold the holster in place, if you opted for the two clip variants minus the mag caddy.
Use a spare rubber grommet from a spare holster and either super glue or 3M molding tape it to the top underside of the circular portion of the belt clip. What this does is make the clip much more suitable for a 1.5" belt while also putting constant pressure on the belt due to the rubber grommet wanting to return to its original shape. See below to see how much space the rubber grommet takes up.
-The outward cant of the clip is designed to push the gun closer to the body, it works, however it can sometimes be overkill and makes the bulge around your belt line bigger. To reduce the cant, use a heat gun/hair dryer/lighter/right at the point of cant until it heats up. Then bend it in the opposite direction to a more suitable position. Hold it in place until it cools into its new position.