Weapon Prestige Questions

So I've prestiged two weapons, that apparently gives you your clan tag on your guns. I see no option to apply this though and can't say I've noticed it appearing on the Strife at least...

• Am I missing something regarding applying/seeing the clan tag, or is the option just missing from the menus awaiting a patch?
• How many weapon prestiges are there, and what are the rest of the rewards?

Much appreciated if anyone has any details to share!