Correct me if I'm wrong but is the 1100 recoil operated therefore O-ring free?
My 11-87 SP (non-Magnum) hasn't choked yet (~500 rounds) even with 1 oz target loads (7½). Maybe, since it is a new gun, it just needs to loosen up for a few more rounds. Might want to try some heavier magnum and/or 3½" loads to break it in.
Other causes could be a plugged or partially blocked hole for the gas. Undersized or broken O-ring.
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- Ron V.
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