How a 1941 Garand Prototype Led to the M14 Gas System

Ian McCollum of Forgotten Weapons visits the Springfield Armory National Historic Site to examine the M1E4, an experimental M1 Garand variant built in 1941 by engineer Earle Harvey. The gun traces the earliest roots of the gas system that eventually ended up on the M14.

Key points

• Borrowed design: Harvey adapted a "gas expansion and cutoff" system from a patent by J.C. White, whose own rifles had failed military testing in 1929-1930.
• How it worked: Gas entered a hollow piston and was cut off once the piston moved a set distance, limiting how much pressure reached the operating system.
• Test results: Aberdeen testing in 1943 showed bolt velocity dropped from about 26 feet per second on a standard M1 to roughly 12-13 feet per second on the M1E4, while still cycling reliably.
• Remaining flaw: The design didn't fix the M1 Garand's tendency to gall in heavy rain, a known issue addressed partly by using grease instead of oil as lubricant.
• Later legacy: After further refinement into the M1E9, the concept carried forward into Harvey's postwar T25 rifle, then the T44, which became the M14, and also into the M60 machine gun.

Quick take

For gun owners interested in the lineage of US service rifles, this video lays out a clear line from a failed 1930s patent to the gas system found in the M14. McCollum's hands-on teardown at Springfield Armory shows exactly how the cutoff mechanism functioned and why it mattered for consistency across varying ammunition and conditions.

Watch the full video: Forgotten Weapons