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414 Posts
That appears to be a Rhino choke tube, missing the color-coded constriction ring, if the barrel is original it's been threaded for tubes. Looks like standard checkering from the 70's to me. That is a Morgan adjustable recoil pad. The 1100 was and is a very reliable hunting/target gun, millions and millions of rounds and thousands of skeet titles went to the 1100 back when they were popular. The O-ring is a non-issue, replace it every 10 thousand shells or so and no problems. This from a 44-year target shooter.
