Blue Archive's abdominal wound and the history of gut-shot survival

What lasting damage would be expected after Sensei's abdominal gunshot wound in Blue Archive if it missed the vital organs?

A penetrating abdominal bullet is judged unlikely to miss all vital structures unless it merely grazed the edge. Gut wounds were frequently lethal before antibiotics.

Dr. Dan questions whether the described injury could miss every vital structure unless it grazed the edge of the abdomen. He distinguishes a penetrating bullet from the possibility of a slower blade displacing soft tissue. Abdominal organs leave little spare space, and a bullet can cause damage beyond its direct path. Gut wounds before antibiotics, including those in the First World War, provide the historical comparison. The fictional premise is questioned, leaving the character's precise lasting injuries unresolved.