Originally Posted by RJay
You can contact the BATFE but unless you have a compelling legal reason , I don't think they will even give you the time of day. Why is the manufacturing date so important? Open the crane, if it is marked Model 36 then it was made between 1957 and 1999. If it is not marked as a Model 36, then it was made 1951-1956.
One reason is to help determine if I can use +P ammo. It is not clear to me whether the older versions will handle the higher power rounds. Of course, I could only use the lower power rounds with no worries...
The other reason is just my curiosity about the history of the weapon. I don't think there are any other markings to help. It is not critical.