[CamoColton]

After part 12 (cartridge stop) releases a round, part 11 (cartridge interceptor) is activated and catches on the rim of the next round in the magazine tube. This is a very simplified explanation but I know my Rem. 870 and Ithaca 37 have practically the same arrangement of two parts working in conjunction to release a round from the mag. tube and then immediately stop the following round from being released as well.

 

[CamoColton]

Does nobody actually know the forces of black magic that causes this to happen? xD

What about Ithaca 37's and Browning BPS shotguns?! Ejecting a spent shell, and releasing a fresh shell from the magazine tube through the same port at practically the same time!! How did they figure that out!

 

[CamoColton]

I'm sure a lot of trial and error was involved when the Ithaca shotgun was designed. (Actually a copy of the Remington model 17 designed by John Moses Browning and John Pedersen).