When I was in graduate school at the University of Illinois in 1968, I took my Springfield MII to the indoor rifle range. The Army sergeant in charge told me that I could not shoot my rifle on the range. When I inquired why not, he said that the backstop would not stand up under the cartridges fired from my rifle.
I showed him the rifle and he had obviously never seen an MII before. He looked it over carefully, then removed the magazine and examined it.
"So that's what those things were for," he said. He went on to say that he had found a whole drawer full of such magazines, but since they fit nothing in the armory, he threw them all away.
