We do not play with guns or any shooting games here. DH has several firearms for hunting and will teach the children to use them under supervision and with all the safety precautions when they are old enough. We want them to know from the start that it is never alright to aim a gun at a person.
We are quite lucky here that there is a pre-schooler television channel which only has wholesome shows on like Postman Pat, Rupert Bear and Playskool type shows and no advertising so he has never been exposed to any shooting/violence off the telly. DS so far has never really pretended to shoot anything and absolutely loves helping DH clean the guns.