I though of a good idea for era, which is a attachment shop for your guns, which the attachments improve the stats of the guns for example, you could have a bar and buy a red dot sight or any type of sight which can improve the spread of your gun so it improves your spread of the bullets also you could by a grip which does the same. You could buy rapid fire so your gun shots a little faster, or something that helps reload faster, you could buy bipods so you can lay down and have the spread improved a lot. Buy silenecers and flash lights and laser sights, this is just an idea that I though would be cool