This thread made me curious, and the gun safe was already open, so I went and checked. My Marlin built 20ga Field Grade, SN FWS 9445 is not marked as to chamber length, but has 2 3/4" chambers. However another Field Grade, FWS 30601 and an Ideal Grade FW SN IE 31151 are marked on the barrel flat opposite the serial number as in the example that David posted. I have hunted extensively with 9445 and 31151 with nothing but 1 oz loads. The only time they see 7/8 oz loads is on the skeet field. Incidentally, I also have a 16ga built in 1933 that has 2 3/4" chambers and is marked with the chamber length in the style of the 3" markings on the LR/WF guns. My 1936 .410 is marked 3" with the same style stamp. Just proves again that you can never say never on an LC Smith.
