Restricted due to it being a cf, semi-auto with a barrel under 18.5", just like every other carbine if the barrel is original. That'd be 18". Has been restricted since 1 Jan.,1978.
Universal's are junk, if it's not an early model. Late models have a toggle for the bolt release, two return springs and a poorly made, stamped, op handle(that tend to break and replacements are extremely difficult to find.). They are not in any way the same as an issue Carbine. No parts other than mags and sights interchange.
Go here. Add the W's. Sadly this site appears to have been abandoned. Best Carbine site on the Net. The .pdf manual and other links work though.
.m1carbinesinc.com/carbine_universal.html