Rock-Ola started producing M1 Carbines in November 1942 & stopped production May 31 1944 . Of the 60 odd components of a M1 Carbine IBM & Quality Hardware made all but two for their carbines. Saginaw Steering made 24 parts,Underwood 19, Winchester 18, Rock-Ola 13,Inland, National Postal Meter, and Standard Products 4 each. The remainder of the components were produced by a great many subcontractors
Carbine production from 1942 - 1945
Inland made 2,642,097
Winchester " " 818,059
Underwood " " 545,616
Saginaw " " 517,212
National Postal Meter 413,017
Quality Hardware " " 359,666
IBM " " 346,500
Standard Products " " 247,160
Rock-Ola " " 228,500
Total Carbines produced 6,117,827 in 3.5 yrs