Heavy Sixer Serial Numbers
I do not have my research materials to hand, but the following is true as to serial number suffixes.V = 12ga. Standard2-3/4' frame/receiverM = 12ga.
Magnum3' frame/receiverW= 16ga.2-3/4' frame/receiverX = 20 ga.2-3/4' frame/receiverN = 20 ga. Magnum3' frame/receiverK = 20 ga. Lightweight2-3/4' frame/receiver (LW)K = 20 ga. Lightweight2-3/4' frame/receiver (LT)U = 20 ga. Lightweight magnum3' frame/receiverJ = 28ga.2-3/4' frame/receiverH =.4103' frame/receiverThe serial number prefixes began with L in 1968 and go up alphabetically from there, but did not change every year.
Serial Numbers Hack
I don't remember where RS fell/falls.Your 12 gauge, isn't.
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