Here is the URL for the NB-4: https://www.instructables.com/id/The_NB_4_Pistol/
No, this gun was just released and it seems like most people don't post mods to things anymore, so it's up to you. You could convert it to an assault rifle or use the mechanism into a replica of a gun. Whatever you want!
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I'm making mods for it
mag-change (el diablo mag) stock, barrel extension, new sights. those are the one i have tried.