Xyz Ar15 Diploma Fixes

sketchfab

I merged the complex shapes of the upper floats with those at the lower level. I also updated the Stock normals to improve their overall appearance. Additionally, I corrected the ris forearm, which was initially created using Fusion 360, and determined whether it required quad geometry for optimal results. Furthermore, I designated certain words on the lower receiver as placeholders for normals in Substance Painter. Finally, I addressed the issue of handle floaters by implementing a solution to resolve this problem.