Okay, policy time. Here is the official statement on guns and props:
Props3 are a great way to enhance cosplay. Many props are considered valuable enhancements to a costume, and will be allowed in as such. If you have any props, proceed to the peace bonding station immediately after checking in. The staff will determine if your prop is acceptable within the Convention Space4. Props which are not allowed within the convention space include, but are not limited to:
Air-soft or projectile weapons
Live (sharp enough to cut) steel
Props wide enough or long enough to inhibit flow of traffic
Props deemed harmless by the staff, such as teddy bears, will be waved through. Any other prop deemed safe by the staff will be peace-tied. This is a tie attached to your prop which signals to all staff that your item is part of your costume and not unsafe to carry. It also signals that you have agreed to carry your prop safely. This means you will not brandish any prop weapon, engage in any mock fighting, or use your prop in any way which could be seen as unsafe.
