America's First Assault Rifle: Burton 1917 LMR
The Burton 1917 LMR, designed by Frank Burton for Winchester, was an experimental WWI aircraft weapon intended to counter balloons and airships. It featured a unique dual 20-round magazine system for 40 rounds total, a select-fire mechanism via a dual-trigger, and was chambered in .345 Winchester Self-Loading. Despite its innovative design, it never entered production, but technically meets the modern definition of an assault rifle.









