John, I collect information about the LCS SBT guns and would like to add yours to the list after some clarifications. I assume the "first generation vent rib" is a compensating rib with round posts underneath. I also assume that the "first generation beaver tail fore end" is without a wood schnable shape. Also could you tell me if there is a precious metal (gold, silver, none) inlay at the junction of the vent rib and rib extension near the breech end? And does it have a banjo shaped escutcheon on the forend? Lastly, can you see a small unslotted screw (looks like a pin) near the right front side of the trigger guard. Knowing these characteristics with gun serial numbers allows us to pin point when changes were made. Thanks for your help.