Disassemble and clean thouroughly. You may be able to see some out of place wear marks on the bolt/inside the receiver when you have it apart that will show the problem. Unfortunately, Charles Daly is out of business. They did not make their own guns though, you should be able to find the manufacturers stamp somewhere on the gun. That should give you a start on where to find parts.
"Suppose you were an idiot, and suppose you were a member of Congress, but I repeat myself." Mark Twain