The point I attempted to make in my comment is this; the fact a Smith gun (of any gauge) was built on a Featherweight style frame does NOT automatically mean that gun is a "light weight". If a gun was ordered to be light weight, either frame size could be used for that purpose. Long before the FW frame was introduced, Hunter offered 16-bore guns as light at 6 1/2 lbs.; and in my opinion no Smith gun has more elegant lines than an early 16-bore with its scaled down R sized frame. And for what it's worth, and in spite of the fact that an example has yet to be located; a thorough examination of the surviving shipping ledgers record a small number of 20-bore Smith guns as having been built on the R sized frame. I'm sure we'll stumble across a surviving example some day just as was the case with the Whippet Grade single barrel trap.
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