My LCS is a 20 gauge. I have had it reworked when I came home from the service in 1969. The neat thing was having the barrels lined. The chooks are improved and modified. If you take your LCS apart you will find identification in three locations.On the steel under the fore hand grip. On the barrels where they lock into the stock. And where they are in the steel of the stock. These numbers should match up. Like mine:195156. This number appears on all three parts. From these numbers you may have a chance of identifying when your LCS was produce. Best of luck. Jimmy