@ClackClackBAM So I just recently bought the FFT fore grip myself. My set, which was black, has an okay fit and finish. I think I will be cutting some of the material at a later point to make it fit better. Since there aren't many options for 922(r) compliance, I can't complain too much. I do think that the OEM is a better fit/finish than FFT. The OEM has a more solid and textured feeling.
I think you have an issue someplace around your hammer spring cap. I might be wrong though bc I thought that pushed up on the hammer engaging it where it is supposed to be. Anyway a group swap is easy especially with Stranger here. Look at this tutorial and see if it nudges your either way.
I know it sounds odd but that's what I used. I didn't actually cut, it was more of a scraping. I gently wore down the flash line from the casting along the 2 long edges of the sling slot. Very little needed to be removed for the clearance I needed. At first I was going to use a very small flat file but I was concerned that it would be too aggressive and leave marks.