My 20 gauge repro doubled frequently. Dewey Vicknair repaired the SST and said there was a component that was cast, but not fitted properly. He said there were a few file marks on it, as though an attempt was made to fit the part. Dewey finished the part, properly, and the gun has worked fine ever since. He also told me that there was no congealed grease in the action, and that it was quite clean and dry.

GMC(SW) - USN, Retired (1978-2001)