So according to my digital caliper the stock one is .195 the Fin is .1995. However on my dial caliper they are .197 and .198. I can take my dremel to it and just sand it a bit. I mean for me .005 of an inch is next to nothing. I checked the angle as well. They appear to be the same angle.
IDK if it matters, but it is a Brazos HPE. I wouldn't think that it would make a difference, but just in case.
Edit.
So I took the gun apart completely as I saw I have failed to clean it in a bit(my bad). I reassembled everything fully, and it slides fully forward. still seems a little stiff, which I can deal with it. I am excited to venture out to the range and try it out... Even if it is going to be 12 on Sunday