My mum banned guns in our house when we were kids, but not swords or bows and arrows bizarrely enough
We made guns out of Lego and sticks instead 
DS has broad swords, daggers, rapiers, bows and arrows, a cap gun, a spud gun, 3 Nerf guns, a star trek phaser, 4 sonic screwdrivers (not technically a weapon), a water pistol and 2 light savers. Oh and a Harry Potter wand.
His play with these toys centres around superhero play, epic battles between dragons, cowboys, wizards, knights, aliens you name it.
I don't "police" his play. I'm far more concerned about what message that gives than "goodies/baddies" role play. I think it's more harmful for adults to "judge" the way their children play. I don't mean intervening in disputes, but to say to a child
"the things you're interested in exploring are BAD". That's not a good message.
It's perfectly natural for kids to want to play violent games sometimes.
I read a fascinating book by Penny Holland, called "We Don't Play With Guns Here". I thoroughly recommend it. She explains the benefits that children gain from war and weapon play. She's an early childhood researcher at a London university.
I think the PC brigade need to rethink their position on guns really.