If anyone is keen in trying the glitch in video above, here are something I think you need to know:
Do this on your own risk. Backup your clean (Narco Road) save data beforehand. This glitch is only executable in Narco Road and the effect (the weapon) stays ONLY in Narco Road. So far it is harmless, but never hurts to play safe.
What you will get by doing this glitch:
1. Placeholder items (weapon) or whatever this may be, under the name of EXO Mounted Minigun and some other with blank name/icon. Some have weapon icon, but without name. Some of these 'broken' weapons (yes, there are multiple and will clutter your list) are actually working, for example as a Minigun, some work as Bazooka. Possibility to have these in Fallen Ghosts DLC?
2. Broken Reward (?) Weapons. There are a set of AK47 with solid vivid color (red, pink, etc) which have their own specific taglines. The stats, however, are complete 0. I call it "Reward" because they have that Crest/Crown icon in the background of the name, just like any themed guns unlocked from Bosses.
3. Story Mode Weapons. As we all know, almost every Story Mode weapons aren't accessible in Narco Road. This glitch allows you to collect them and use them.
4. Story Mode Boss Weapons. This glitch allows you to collect and use Story Mode Boss Weapon in Narco Road.
5. Narco Road Exclusive Epic Weapons. This glitch also allows you to collect and use NR exclusive weapons to be unlocked earlier.
6. Game Themed Weapons. Weapons such as GRFS ACR are unlockable and usable thanks to the glitch, even though you don't have the GRFS pack.
7. Future reward weapons. Not sure for what kind of reward specifically, but they are already usable in the game.
8. Ghost Pack Weapons. The main kicker of this glitch. This allows you to use weapons coming from Ghost Pack in the Store, released and unreleased ones, because we actually already have the data.
I can understand if people won't feel any remorse for exploiting the glitch, especially the Ghost Pack weapons considering how expensive they are. However it is, let's just take the glitch positively. Thanks to the glitch, we can see what's coming in the future (although nothing great). Don't forget to support GRW if you think there are some Ghost Pack guns you like.