The mod replaces the carbine in the game with the HK416D tactical 2 Version with laser grip, Tasco Aimpoint scope, different stock and silencer. It also looks pretty attractive.
Installing Upload files to path Grand Theft Auto VModsupdatex64dlcpackspatchday8ngdlc.rpfx64modelscdimagesweapons.rpf In my case Grand Theft Auto Vupdatex64dlcpackspatchday3ngdlc.rpfx64modelscdimagesweapons.rpf
Attention modules will be replaced in other weapons. But they also look great.