None that I'm aware of. I've had the 2020 in mine for some time with quite a few rounds through it, and it's the same feeling and condition as when I installed it...smooth, clean break. I've never tried the NT, so I have no comparison. I'm very happy with the dramatic improvement of the 2020 over the OEM trigger. Are you sure you got the install procedure correct? Though not rocket science, the procedure has a little bit of complication in the trigger pack.