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The Remington era specification sheets reproduced on pages 164 - 169 of The Parker Story call for a 10-gauge with a 2 3/4 inch chamber intended for the standard 2 7/8 inch shell, 12-, 16-, and 20-gauges with a 2 5/8 inch chamber intended for the 2 3/4 inch shells, 28-gauge with a 2 13/16 inch chamber intended for the 2 7/8 inch shell and the .410-bore with a 2 15/16 inch chamber for the 3-inch shell. Other chamber depths optional.
Threaded Mode