This AT-ST is one of the older Star Wars sets, but it contains no weapons for Chewbacca. However, the guns on the AT-ST are made of the lightsaber pieces that are of a grey finish (not painted silver.)
This is a description taken from LEGO.com. Do not modify it.
Chewie saves the day!
In the heat of battle, Chewie commandeers the Imperial AT-ST. When Han and Leia see the machine approach, they think all is lost until Chewie bursts out the top! Now you can be part of the action with this lifelike set, complete with blaster cannons, legs that "walk," and a command cabin!