What would happen if you switched weapons on missions?

Nat: That would never happen.

Clint: Why? I don't mind shooting your bites.

Nat: Clint, you can't fit my Widow's Bites.

Clint: But I can shoot your pistols.

Nat: You know I carry much more than pistols.

Clint: Do I have to play Tetris on your body?