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First off...don't worry so much about standard receiver vs. magnum receiver. A 12 gauge 1100 is a 12 gauge 1100 regardless of the size of the chamber. The round this gun is set up to fire depends solely on the configuration of the barrel. If you buy a 3" chambered 1100 barrel, you can fire 3" shells with no issue other than changing out the action sleeve. If you have questions, my recommendation would be to call Remington and discuss it with them.
Jason
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