The barrel is cut down to 19” and the stock looks like it was shortened in the back. Looks pretty much like the whippet in the Bonnie and Clyde pics jmr40 shared.
I’ve read a bunch about Bonnie and Clyde but had never read about the whippet. Cool!Somebody tried to make a Whippet. They were short guns used during the 1920's and 30's concealed under a coat. Bonnie and Clyde liked them.
Remington Model 11 Whippet: Bonnie and Clyde’s Shotgun | Garand Thumb Blog