Oh, you went and broke it!!
Actually, that barrel is from a Colt Ace. The chamber "floats," supposedly to simulate more recoil. See how the tab on the bottom of the barrel can move within the slot? It looks like maybe there's too much "gunk" in there to "float" back closed.
My advice is hit it with a good spray cleaner and work the chamber back and forth a bit. You should be fine.
ETA: From the manual: "Once the barrel is removed, the floating chamber can be rotated and separated from the main barrel for cleaning."