List of Military contractors for M1 Carbine

The last one (#11) is probably astronomically expensive.

Military contractors (Wiki)

1.Inland Division, General Motors (production: 2,632,097), sole
producer of the M1A1 Carbine. Receiver marked "INLAND DIV."
2.Winchester Repeating Arms (production: 828,059) Receiver marked "WINCHESTER"
3.Irwin-Pedersen (operated by Saginaw Steering Gear and production
included with Saginaw total)
4.Saginaw Steering Gear Division, General Motors (production: 517,213
) Receivers marked "SAGINAW S.G." (370,490) and "IRWIN-PEDERSEN"
(146,723 )
5.Underwood Elliot Fisher (production: 545,616) Receiver marked "UNDERWOOD"
6.National Postal Meter (production: 413,017) Receiver marked
"NATIONAL POSTAL METER"
7.Quality Hardware Manufacturing Corp. (production: 359,666) Receiver
marked "QUALITY H.M.C."
8.International Business Machines (production: 346,500) Receiver
marked "I.B.M. CORP." Also barrel marked "IBM Corp"
9.Standard Products (production: 247,100) Receiver marked "STD. PRO."
10.Rock-Ola Manufacturing Corporation (production: 228,500) Receiver
Marked "ROCK-OLA"[85]
11.Commercial Controls Corporation (production: 239) Receiver marked
"COMMERCIAL CONTROLS"