For anyone installing the GTAC engineering grip conversion with a competition trigger you may, or may not run into a tolerance stacking issue that's not difficult to fix. The rail that the comp trigger shoe slides on is a little longer than the AI factory trigger rail. Check the clearance at the rear of the trigger. Mine required shortening and rounding the corners of the rail as you can see in the photos. Put the trigger in a plastic bag with the rail poking through and carefully round the corners with a grinder. It does not take very much. You could also lengthen the rear slot of the trigger in the GTAC trigger guard but that area is very close to the rear screw and I didn't want to remove any material there. Have fun!
