I have an old 1100 (30 inch barrel) that I have considered cutting down similar to OP, but I have read mixed reviews online about going shorter than 21" on the gas operated 1100. Let us know when you can how well it works with the 19" barrel. Also, was this a 2 3/4 or 3" chamber? I've read the gas ports are smaller on the 3" guns increasing the problems with shorter barrels.
It had a 28", 2-3/4" barrel. When I first cut the barrel, it would not completely eject Estate #8 rounds, but it still cycled Estate #4 rounds without issue. That failure to eject the #8's was only because the outside of the mag tube was extremely dirty. After I disassembled and cleaned the action it has chewed through two boxes of #8 without a single hiccup, both slow and very rapid fire. I have full confidence in its functionality now. I believe it is only the 3" chambers that have the issue you describe, or people who don't realize how dirty their action is.
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