▁who ▁knew ▁John ▁Gar and , ▁the ▁weapon ' s ▁designer . ▁Fre qu ently ▁referred ▁to ▁as ▁the ▁" G ar and " ▁or ▁" M 1 ▁Gar and " ▁by ▁civ ili ans , ▁its ▁official ▁design ation ▁when ▁it ▁was ▁the ▁issue ▁rif le ▁in ▁the ▁U . S . ▁Army ▁and ▁the ▁U . S . ▁Marine ▁Corps ▁was ▁" U . S . ▁R if le , ▁C ali ber ▁. 3 0 , ▁M 1 " ▁or ▁just ▁" M 1 " ▁and ▁Gar and ▁was ▁not ▁mentioned . ▁ ▁History ▁ ▁Development ▁French ▁Canadian - born ▁Gar and ▁went ▁to ▁work ▁at ▁the ▁United ▁States ▁Army ' s ▁Spring field ▁Arm ory ▁and ▁began ▁working ▁on ▁a ▁. 3 0 ▁cal iber ▁primer ▁actu ated ▁blow back ▁Model ▁ 1 9 1 9 ▁prototype . ▁In ▁ 1 9 2 4 , ▁twenty - four ▁rif les , ▁identified ▁as ▁" M 1 9 2 2 s ", ▁were ▁built ▁at ▁Spring field . ▁At ▁Fort ▁Ben ning ▁during ▁ 1 9 2 5 , ▁they ▁were ▁tested ▁against ▁models ▁by ▁Ber th ier , ▁H atch er - B ang , ▁Thompson , ▁and ▁Ped ers en , ▁the ▁latter ▁two ▁being ▁delayed ▁blow back ▁types . ▁This ▁led ▁to ▁a ▁further ▁trial ▁of ▁an ▁improved ▁" M 1 9 2 4 " ▁Gar and ▁against ▁the ▁Thompson , ▁ultimately ▁producing ▁an ▁incon clus ive ▁report . ▁As ▁a ▁result , ▁the ▁Or dn ance