The guy I bought it from, said the gun has 2 3/4" chambers, I am going to verify that when it comes in. I have read conflicting information on when exactly LC Smith went to 2 3/4" for 16ga guns.... I have read some guys saying they have mid 30's era guns that have 2 3/4, and some saying the shorter chambers...

Is there any "firm date" when this occured?