Re: 'There's a wolf on the school' - The Booboo Stewart Thread
They should keep the gun if the future is really chaotic and full of Sentinels, assuming the movie will feature Bishop in the future.
As for Forge, give him the gun too whether he's in the 70s period or modern times. I don't think people would mind having 2 new characters with energy guns.
Their gun is part of their look in the comics and it doesn't even look costumey and cheesy, so I think they should keep it.