u/Cletus716

Hey everyone,
I live in Erie County and have a glock 43x. I want to replace my bronze/coyote colored upper with a black MOS slide. I know I can order it and have it shipped to my house. My concern is that the upper will have a different serial number than my frame. Will this be an issue? Do I need to go down to the Clerk’s office before/after I receive it to have both serial numbers on my permit?