MARX Vintage Miniature Toy Replica Six Shooter Western Colt Revolver Handgun with Hammer and Safety Lock Slide Set of 2

In good used condition. Has a slide to lock it. The hammer pulls back. I was told this is a cap gun, but not sure where or how that works. There is a steer engraved on the grips. Approximate size is 3.5" x 1.5".