How to make the gun stuff like phantom forces?

I want my guns to be like phantom forces, I which the guns don't have a hotbar but you can still use them. I don't know how to make a viewmodel be the one that holds the gun or item. Just look at Deadline. See what i mean? I don't know how to do that. If you do know what i mean, Or you made an FPS game, like the aforementioned games, Please tell me how you did it. I'll be all ears. And if i don't understand, Message me on Discord. (urboilemon#4760). I will let you edit the game im making and ill customize the arms to not have the same texture.

PLEASE HELP ME