I'm not certain ejection is completely the same as the Model 37, but the Kel-Tec KSG and KS7 shotguns are modified John Browning Remington 17 and Ithaca Model 37 designs.
In these the ejectors are probably the simplest and most trouble free of any shotgun ever made.
The ejectors are nothing more then two recesses machined in the bottom side of the shell lifter.
When the slide is pulled back the bolt extracts the shell and pulls the case rim into these two cuts, ejecting the shell downward.
The lifter does not begin to move downward until after the shell is ejected by the ejectors.
Here's the shell lifter from a Kel-Tec KS7 showing the ejectors. John Browning simplicity at it's best ........
