Thank you for all the input. I had no idea that this might be such a unique gun. I haven't had time to work on it, having recently moved and just finished building a new studio, so I've been out of the loop for a couple months. I'm tapped out, so will have to move forward slowly. Since this is not the original stock, my intention is to convert to a straight grip, and try to make it look as original as possible. Before I do so, were there straight grips produced in the 6k serial number range? I would assume so, but don't want to assume incorrectly. Thanks.