i got the info from here Federal Ordnance M1 Carbine i will put up pic. if i can i never have on this site.if you will read the story fed ord got 300 inland receivers by mistake and the owner was on a trip. never new the shop foreman build the carbines and sold them. the carbine is all us mililtry parts the barrel is the mystry with the I0 on bottom of flat. the inland recivers numbers 675xxx the story makes for a special carbine for me anyway.