like Singer Sewing Machines or General Motors.
I believe Singer only made 500 copies of the 1911. A Singer 1911 can run around $100k these days or even more if the parts match up. Most of the parts from original Singers were swapped into other 1911s that many of the other manufacturers made, like Ithica, Union Switch and Signal, Colt, and Remington Rand.
GM actually made a lot of receivers for the M16 rifles used in Vietnam. The lower receivers were made in the Hydra Matic division, or the ones that make transmissions. They also made some M1 carbines though. Here are some examples. Image: http://www.warrelics.eu/forum/military_photos/firearms-ordnance/60759d1256795757t-my-m1-carbine-general-motors-ind-pa262712.jpg
But as others have said, keep that carbine. They are great little pieces and heirlooms that should be passed down. Ammo is a bit pricey but if you get into reloading you can save a good bit of money.
Here's to America's soldiers, past and present!