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Regular (R) frame guns were manufactured in three dimensions depending on when they were made (Syracuse and Fulton pre-1898, post-1898 12gauge, and post-1898 16 and 20 gauge).
Featherweight (FW) frames (introduced in 1909) were produced in two sizes (12 gauge and 16/20 gauge).
Post-1913 Field Grade guns were built on both regular and featherweight frames, especially up to about 1920, after which most were featherweight.
It has not been confirmed if 20 gauge guns were ever built on regular frames.
Only six experimental “C” frame guns were produced, all in 1929.
The Long Range Wild Fowl guns were made using the regular frame, but were slightly wider and heavier.
The engineering drawings may be found on this website and on page 372 of John Houchins' L.C. Smith "The Legend Lives."
This photograph shows a 2 ¾ inch 12 gauge regular frame (l.), 3 inch (Wild Fowl) 12 gauge regular frame (c.), and a 2 ¾ inch 12 gauge featherweight frame (r.)
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