When a round is still in the chamber after a pistol magazine is reloaded (slide doesn't lock back if round is still in chamber), there should be a mod that increases the capacity by 1. Also, this hypothetical mod should prevent the player from racking the bolt on a non-pistol/non-shotgun weapon if there is still a round in the chamber (or at least increase the capacity by one round). I do have to admit, the round being racked out of a rifle and hitting the ground is pretty cool though.