My idea is make a game who you can costumise guns but EVERYTHING barrel, silencer, mag, camo, taticals like laser and light and every thing.
But you can costumise in game (in battle camp) but you after need to select the items you go in bag, mags, silencer and more and all in first person.
And game have a big map and lot of missions, single player and multiplayer but in multiplayer you play stile of rainbow six siege 5v5 (e.g).
And I'm only share this idea because I'm don't know any game of this type for consoles and pc you can costumise in battle ground and in my opinion is great game