You Kept those guns.Lucky!...M1 carbines are now over 600 bucks in most places.
Saginaw Steering gear made the receiver, the Magazine release is an M2 for the 30 round mags. No bayonet lug means it may have the early band on it.
The adjustable sight is later replacement from the early "L" flip sight. The lever safety is also later replacement for the old push button.
As for having the M2 PARTS...I wouldn't have them in possession or readily available ... maybe buried in the back yard or at a friends house that doesn't own a Carbine, 10 years Federal time wouldn't be fun at all.....