10-090 Garand Picture of the Day - more gas traps

Army Maneuvers, Ft. Houston, Texas
Date taken: June 1939
Photographer: Thomas Mcavoy

Picture date 1939 - they are all Gas Traps

https://www.milsurps.com/images/impo...5e_large-1.jpg

https://www.milsurps.com/images/impo...f4_large-1.jpg

https://www.milsurps.com/images/impo...d0_large-1.jpg

Do any of you Garand History buffs have any thoughts on why John C. opted for the "Gas Trap" system rather than the already proven port and piston?

Think that S.A. did not like the idea of a hole drilled in the barrel.