I just got a AA drop in trigger. After the installation, I like the feeling of the trigger. Only one issue is that I feel the slide is not as smooth as with the OEM trigger. When I am trying to pull back the slide, I almost feel like hit on something first, then I need apply more force to pull back to overcome the obstacle then the pull will be like the original feel. Any one have similar feeling on aftermarket trigger? Any way to resolve it?