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There are many elastomeric compounds that are impervious to petroleum based lubricants, including Viton which is what is most widely recommended and sold for 1100s/11-87s. Nitrile and Buna-N are less likely to hold up. Neoprene is available from industrial suppliers, but who needs 50? I have one that has been in the gun, and shot heavily, since about 1967, and it is still fine. Ham handed cleaning is the most likely O-ring killer. The ones you see advertised as made of Teflon are not in my limited observations, which is good because Teflon is not very elastic. If you want it to look gray and shiny like Remington's, put the Viton ones in a sandwich baggie with some graphite lock compound and shake.
Many 1100s will cycle okay with no O ring at all installed, in fact one of my three will with 1-1/4 oz or heavier loads.
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