Not a 20 ga but when I was shooting trap with an 1100, I was taught by the old guys to polish the surfaces where the o-ring works, down to bare metal, coat o-ring and surfaces with silicon lock tumbler lube, the stuff that evaporates. Old timers said never use petroleum oils in that area.I shot thousands of rounds with home loads that were below 5,800 LUP, that's low. Do not be influenced by a garage gunsmith that wants to cut a turn off the buffer spring...you will eventually hammer your action unto death.
