504PIR, the word “Bannerman” comes to mind.
As you may not have heard of this company, a word of explanation is on order. From what I have read, it seems that Bannerman became notorious in the late 19th C. for buying up obsolete/replaced/reject components as scrap from Springfield and then turning them into complete guns which were then sold as being original. This led to Springfield stopping such sales when the fraud was discovered. So “Bannerman” is a generic name for Springfield “bitsas”, although what we see here could have been made by anybody, any time.
Summarizing the content of this thread, there seems little doubt that this is such a “bitsa” made from a cut-down rifle system installed in a very second-hand carbine stock.
I hope it’s a good shooter.