If you are looking for the gallery, see Colt Trooper Gallery.
Colt Trooper

In Season 1 Episode 5, Wildfire, just before the group leaves for the Center for Disease Center Headquarters (CDC), Rick Grimes (Andrew Lincoln) gives Morales (Juan Gabriel Pareja) what appears to be a Colt Trooper in .357 Magnum with a box of Ammunition from the bag of guns when Morales, his wife Miranda Morales, his daughter Eliza Morales and his son Louis Morales decide to leave the group to find their family in Birmingham. You can also hear Shane Walsh (Jon Bernthal) say ".357?" as well when Rick is getting it out of the bag.