If this in fact is an I-P that is not a mixmaster & not gone thru a rebuild, that would be a rare carbine. Chance are it has, so yes it's a rare receiver only . It would only command a little higher price. Any carbine that is still as-original would be more valuable, even more would be an M1A1 as issued, or and early Inland with Canadian Broadarrow stamps.
I-P made 3,542 fully assembled carbines, but over 24,000 carbines with I-P stamped receivers were delivered to the US Government, courtesy of Saginaw S'G'. Majority have Underwood and Rock-Ola barrels.
Be aware that fake and replica parts abound, as I-P's are perceived to be real collectables.