I'll see if I can find pics later, but last year I picked up a Remington model 8.
For those unfamiliar, the model 8 was the first commercially successful semi-auto center fire rifle in the U.S.
Mine was produced around 1935 if I remember correctly.
It is chambered in .35 Remington and has a unique recoil system.
The barrel is almost entirely encased in a barrel shroud, which is internally loaded with a dual recoil spring setup, one spring inside another.
The entire barrel reciprocates rearward with each shot.
Advertising at the time boasted, "Fire all 5 shots before the first empty case hits the ground".
A law enforcement version of this gun is what Texas state trooper Frank Hammer used to cut down Bonny & Clyde.
His had a detachable 15 round magazine, and was also chambered in .35 Remington.