B.S. on the "fragile" 'O' ring on 1100s and 11-87s. Internet legend. They do not move in service - they are a static seal. 99.9999% of issues are caused by ham handed owners when they dis assemble the gun and cheapskates/don't know betters using hardware store plumbers 'O' rings that are not resistant to petroleum products. I have had 11 different ones, and still have my '63 bought new, and have never had an 'O' ring fail in use. I tore one on the 20 one time when I was talking when I was putting it back together, but it was still working when I changed it. The '63 has had the same one since I changed the metal 'V' ring to an 'O' ring in about 1967 so I wouldn't lose it.