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From Dennis on Patreon:
"What rifles were between the M1 Garand and the M14? I went through Basic with an M14 and I know the M15 was supposed to be a BAR relacement. Google doesn't really find anything on the M2 M13 rifles."

The Army had rifle for much more than just standard infantry use. They also adopted rifles for marksmanship practice, sub caliber firing of artillery, pilot survival (as the Army Air Force), and spotting. Here are the M2 through M13:

M2 Springfield .22LR training rifle (updated from the M1922) (   • John Garand's .22 Trainer: the Spring...  )
M3 Not used
M4 Harrington & Richardson pilot survival rifle; bolt action .22 Hornet
M5 Subcaliber .22LR adapter for 37mm guns
M6 Ithaca pilot survival combination gun; .22 Hornet over .410 shotgun (   • Luftwaffe Drilling and US M6 Survival...  )
M7 Subcaliber .3006 adapter for the 75mm recoilless rifle
M8 Spotting rifle for the 106mm recoilless rifle (   • A Gun For Aiming: M8C .50 Caliber Spo...  )
M9 Subcaliber .3006 adapter for the 106mm recoilless rifle
M10 Not used
M11 Not used
M12 Harrington & Richardson .22LR training rifle
M13 Remington .22LR training rifle

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