- The WW2 USGI Springfield Armory M1 Garand en bloc clip is a metal clip that is used to load and feed the M1 Garand rifle with .30-06 Springfield cartridges. The en bloc clip is inserted into the rifle's internal magazine and contains eight rounds of ammunition. When the last round is fired, the clip is automatically ejected from the rifle with a distinctive "ping" sound. The en bloc clip is a critical component of the M1 Garand's operation, allowing for quick and efficient reloading of the rifle during combat situations. The USGI Springfield Armory was one of the main manufacturers of these clips during World War II, and they remain an essential part of the M1 Garand's design and history.