Barrel didn't fit properly - Bishop Defense Glock 43 Pistol Slide

So it's very excited to get this item and when I did receive it I had a brand new upper parts kit and the barrel did not fit that I also purchased from you guys It fit into my other slide because I have two different Glock 43 X's so the barrel I don't think was the issue is the slide that was way too tight on the sides and it scratched top and sides of the new barrel and it didn't even seed properly. I don't know if that's the correct terminology or not but it would not fit all the way and lock into place therefore I could not rack the slide.