He wants NVR, not NVE.
I think the Rockstar Games Launcher doesn't let you mod your game though. That may be the issue. From what I know GTA 5 can be modded on steam and epic games.
https://www.gta5-mods.com/weapons/realistic-shootouts-enhanced-0-9-beta-gtav-weapon-sound-mod
This is what I'm using. Works just fine singleplayer, however on the server it isn't. Any way to solve this?