No, they weren't.
Planefield
Plainfield Machine Co Inc produced approximately 80,000 Presentation Model M1 carbines between 1964 and 1970. These carbines were manufactured as a semi-automatic version of the original military M1 carbine. The production was part of Plainfield's efforts to meet civilian demand for firearms during that era.
You did not give us a serial number, but ALL US military M1 Carbines were made between Septemer 1941 and August 1945. Inland produced 2,632,097 M1 Carbines, and was the only maker of the M1A1 folding wire stocked carbine.
Non firing replica M1 and M1(A1) Carbines are made by Hudson, airsoft Carbines are Made by Marushin, they go for around $300.
IBM was one of the makers of M1 Carbines- along with companies that made postage meters and juke boxes.
No.
Marlin has manufactured machineguns and submachineguns for the US military, as well as making M1Garand barrels, and parts for M1 Carbines.
It should if it fits on other kinds of M1 Carbines.
Metal slotted handguards were used on the fully automatic M2 for better cooling. Some people now put them on M1 carbines simply because they like the look. They were never used on M1s in the military.
Quality Hardware & machine Co.. Made m1 carbines from Feb1943 to May 1944
M1 carbines are semi-automatic and M2s are full automatic.
All military M1 Carbines were made between 1941 and 1945.