So as I was cleaning my Springfield M1A yesterday I noticed that it (seems) to be possible to fire the gun before the lugs lock into place.
That's mechanically impossible. At .100 inch out of battery, the lugs are about 90% vertically engaged, so even if the gun could fire by pulling the trigger...which it can't...the slide and barrel would be connected, and the breech can't open.
At .100 inch out, the face of the hammer can't reach the firing pin. So, even if the disconnect failed, it still can't fire.