thanks for the input guys!
hk, thanks for the link, i assumed the swivel studs and sling were not correct for this rifle. the buttstock has a long slot cut in the left side of it but there is nothing in it. i assume it was the original sling mount.
cap, that's just it, aside from the serial numbers and small spanish crosses, there are no markings on this thing at all! i don't think it is a carbine, i think it is a short rifle, as the barrel measures around 22" rather than the 17-18" i've read the carbines to be. from the rear receiver tang to the muzzle is just under 30" and overall length is about 41.5"