The GUNS UP! Team has implemented a server upgrade that we believe will solve the issues surrounding the Lvl 6 Perks reported by a handful of players. From this point forward, Lvl 6 Perks should be received at the time of the Upgrade without the need to reboot the title.
If anyone else experiences this issue please reach out to us and provide as much detail on your situation as you can. Thanks.
-The GU! Team