each anticheat enabled server has a list of accepted/not accepted files (skins, models, etc), so it's the job of the server admin to make the required modifications to allow new files
as a side note, I don't like the included blaster projectile, it looks ugly to me

K, thnx I wasn't sure that this was a server side issue, could u elaborate the procedure to add files to the list of accepted files, does the admin like need to add an exception for each seperate file. I'm asking so I can convince the server admin more easily in case he refuses because he's too lazy or something

And what blaster projectile are you referring too? I couldn't find any blaster in the screenshot nor did I see any projectile.