▁first ▁production ▁model ▁was ▁successfully ▁proof - f ired , ▁function - f ired , ▁and ▁fired ▁for ▁accuracy ▁on ▁July ▁ 2 1 , ▁ 1 9 3 7 . ▁ ▁Production ▁difficulties ▁delayed ▁deliver ies ▁to ▁the ▁Army ▁until ▁September ▁ 1 9 3 7 . ▁Machine ▁production ▁began ▁at ▁Spring field ▁Arm ory ▁that ▁month ▁at ▁a ▁rate ▁of ▁ten ▁rif les ▁per ▁day , ▁and ▁reached ▁an ▁output ▁of ▁ 1 0 0 ▁per ▁day ▁within ▁two ▁years . ▁Despite ▁going ▁into ▁production ▁status , ▁design ▁issues ▁were ▁not ▁at ▁an ▁end . ▁The ▁bar rel , ▁gas ▁cyl inder , ▁and ▁front ▁sight ▁assembly ▁were ▁red es igned ▁and ▁entered ▁production ▁in ▁early ▁ 1 9 4 0 . ▁Ex isting ▁" gas - t rap " ▁rif les ▁were ▁re called ▁and ▁retro f itted , ▁mirror ing ▁problems ▁with ▁the ▁earlier ▁M 1 9 0 3 ▁Spring field ▁rif le ▁that ▁also ▁had ▁to ▁be ▁re called ▁and ▁re work ed ▁approximately ▁three ▁years ▁into ▁production ▁and ▁for esh adow ing ▁re work ▁of ▁the ▁M 1 6 ▁rif le ▁at ▁a ▁similar ▁point ▁in ▁its ▁development . ▁Production ▁of ▁the ▁Gar and ▁increased ▁in ▁ 1 9 4 0 ▁despite ▁these ▁difficulties , ▁reaching ▁ 6 0 0 ▁a ▁day ▁by ▁ 1 0 ▁January ▁ 1 9 4 1 , ▁and ▁the ▁Army ▁was ▁fully ▁equ ipped ▁by ▁the ▁end ▁of ▁ 1 9 4 1 . ▁Following ▁the ▁out break ▁of ▁World ▁War