The Pistols use the same ammo. All the Rifles use up the same ammo.The SMG's use the same ammo. The MG's use the same ammo. That doesn't make any sense. Play survivaal and you will notice exactly what I'm talking about. Use up the Micro SMG and the ammo for the SMG and Assault SMG go bye'bye. Once your assault rifle ammo is empty, so does the Carbine and Assualt Rifle become empty without you even using those two weapons. The number that represents the ammo are even similar, if not, the same. isn't that a rip-off. Rockstar really thought that they could just sneak that in there without someone finding out. Again, I think I get the idea that the same type of weapon would use the same ammo, but still. It's pathetic. It doesn't make any sense. All those fancy atachments for nothing.
I get the concept but that's like so messed up. I literally don't even bother buying ammo from Ammu-Nation anymore cause I see that there will be no difference filling up every type of weapon. I just get ammo from Survival or Team-Deathmatch off the ground. You use up the MG and the Combat MG becomes empty. How then can I get the expensive extended ammo for both MGs if they use up the same ammo? I'm rank 91 and can get the Heavy Sniper (which costs 35.000), but I don't even see if it's worth it. The Sniper will take it's ammo from it. Believe me this.