Please do note the fact that a 3" shell will go in the chamber & the gun close & bolt does not mean it is chambered for a shell of that length. The length of a shotshell is determined by its total,"Uncrimped" length. A 3" shell with a fold crimp will enter the chamber of most 2˝" chambered guns & the gun close & bolt, but they "Should Not" actually be fired in them.
As to value I will just say I would much rather pay $150.00 for this gun than to sell it for that if it were mine.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra