I'm not sure where this underlug business really got its start, but I was around when it really got rolling. A term that relates most commonly to DA/SA revolvers, underlug refers to an integral extension of metal that runs along the bottom side of the barrel.
Developed after World War II, the m/45B or “Swedish K” submachine gun was used by Swedish troops in hotspots such as the Congo, but more significantly by U.S. Special Forces in the jungles of Vietnam.
Engineers at the Fémáru és Szerszámgépgyár NV (Metal Products and Machine Tool Factory Company) in Budapest developed a military-appropriate sidearm by combining the R-61’s lightweight alloy frame with a 4" barrel in 9 mm Makarov, which is how the PA-63 was born.
Seventy-three years after Marine Pvt. Harry Tye engaged in one of the bloodiest battles of the Pacific Theater in World War II, he is finally home and laid to rest at Arlington National Cemetery.
The U.S. Army Rangers storming Pointe Du Hoc were not the only Allied troops using Vickers K Guns on D-Day. If you read about the K Gun in Marty Morgan’s "The Forgotten Guns of D-Day" article and were curious about the Vickers K Gun, here’s more on British Commandoes use of them.