FWIW four of the five 12-gauge Remington Hammerless Double Barrel Shotguns in my collection have chambers that measure 2 5/8 inch. My FE-Grade Trap Gun has chambers that measure 2 3/4 inch but I suspect they may have been lengthened. It belonged to an old Pennsylvania Pigeon shooter and has a beavertail forearm and the choke of the left barrel was, I suspect, opened to .018".
My rather hap hazard table of observed high grade Remingtons has 18 D quality hammerless doubles on it. The nearest to this gun in question was 121359 with a straight grip stock which was for sale by the Cabelas in Lacey, Washington, a few years back. My note says "butt extension."
Phil,
Charles Semmer's article in The Double Gun Journal, Volume Twelve, Issue 3, page 143, about restocking a straight gripped DE-Grade with a horribly broken stock might be of interest to you.
Dave
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