There is a complete Field Grade ejector iron on eBay for sale now, looks like an iron originally intended for a second barrel set; but can't tell if it is a standard or FW frame iron. I have seen examples of early higher-grade Smith guns without dimpled ribs; don't know the reasons, but I'm sure some buyers instructed the gun works to omit that feature. I do not think those barrels have been cut, but only a factor research letter will confirm original barrel length.