Older WW1 combat pump shotguns do not have disconnectors. US troops would practically keep the trigger depressed and slamfired the gun with each cycle of the slide.
That can be done very fast and resulted in many turks and germans with heads blown off( literally). The US protested this protest....
even up to now.. Military shotguns are mainly anti material weapons. Our troops use it to destroy the enemy's clothing... The devastating wounds it produces is simply... Collateral damage.
Ithaca 37's made prior to 1975 will slam fire as well. The Ithaca earned a good reputation in Vietnam as there was less chance for crud to get inside.