I purchased a used 111 Chiefton in 7X57 and took it out to the range to get it sighted in. The gun itself looks to be in great shape anyhow I opened the bolt and all of sudden the Rear Baffle Assembly falls off the bolt???? I say what the Fudge and proceed to install it back on the bolt. It went back on but I choose not to fire it. I know this is not normal. Any advice on what happened. Thanks in advance