I'm looking for some realism on my next playthrough. I feel having thousands of rounds of ammunition for each gun is a bit too much. I looking for something that limits the ammo count, so you can actually run out of ammo and be forced to pick some up from fallen enemies. Maybe even a weight system, where you can only carry so much guns and ammo with you at one time. It'd be nice to have your own gun locker to store and choose what guns to have on your person as well. I'm probably asking for too much, but is there any mod that resembles this?

@ReNNie

Best and most reasonable answer so far. Thanks for the insight.

This site is hands down the best place for GTA V mods. Why don't we have Modpacks section similar to what minecraft has? It can take a ridiculous amount of time to compile mods together. Right now I'm creating my own modpack that changes every car in the game into what they would actually be IRL (Sabre to a SS Chevy Nova, Cops cars to crown victorias, ect). I wouldn't mind sharing my modpack or downloading other modpacks to try. A modpack section would suit this site well. Is there a reason why we don't already have one?