They may, but very expensive, hence you only see big name games use them, sometimes free-to-play cause they're not making any profit. Era probably uses them because either they don't know any better or they believe they will be under radar so they'll never find out. Either that or a share of all the profit from Era consumers would be transferred to the copyright owners. Add that to the fact that iTunes gets a share as well. Barley any profit to be made.
Nick/Integrity
Back when the AK was the shizznit
This is my point "game can use copyrighted WEAPONS" but players can't copywrite real life people such as spongebob and Master Yoda customs, been trying too make this point since IOS Era started
Ion carbine was an original design. Guns aren't copyrighted as they are all based on real guns. Gm4 is just an m4 with a silencer than ghosts wanted to make sound fancy. Mtarx is a real gun. Ghost ripper is the only slightly original gun ghosts made but yea it doesn't count as "copyright" as the guns are inspired from them and not directly ripped from the actual game.
In terms of actual copyright, look at all the "minecraft" replica apps on the app store, and apple allows/accepts them to be submitted. The reason why they are allowed is since they are named differently and are not the exact same as the actual minecraft game
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Five sevens from cod are based off the FN57 which is a real gun lol... Cod didn't design the fn57 that is used in real life. Same way games like battlefield have guns like the ACR but rename it to things such as the ACWR in order to avoid copyright.
Another example I can give are all those other ipad/ios games on the app store that have custom guns (one example is dead trigger 1/2) you can buy for inapp purchase or custom armour based off of tron (forgot the name of the app)
If they're real guns, they have a trademark, and the licensing for that is required. Even guns that look similar are subject to trade-dress infringement which can be applied to any case if reasonable suspicion of copyright infringement is identified. Multiply that by the fact that by Graal defending itself from huge companies and it could be shut down in a jiffy.
Nick/Integrity
Back when the AK was the shizznit
Well i'm yet to see any independent game get shut down or brought to court for those reasons. Gun manufacturers make more than enough money to need to care about developers recreating their guns.
And as I said before, AAA games like Battlefield 4 obviously didn't require the license to use the name of certain guns in their game, yet the game gun models perfectly replicate, and names are similar to those actual guns