Universal made some very decent carbines. I've got one that I recently rebarreled with a non restricted length barrel.
I've had this thing since the seventies and to tell the truth, mine was trouble free and quite accurate. It was one of their earlier efforts and parts, like the trigger housing and bolt are GI surplus. The only time it ever gave me any trouble was my own fault. I put way to much 2400 powder into the case.
As long as I did my part and fed it properly, not one malfunction. No failure to fire, no failure to extract. It just did exactly what it was supposed to do.
The Universals went through several series and with each series there were changes.
Google the name and look at what they have to say about them. One thing about mine, it was certainly a lot more accurate than any of the milsurp M1 Carbines I've had the privilege of shooting. It's original barrel, looked like the Marlin "Micro Grove" style of rifling. The new barrel isn't quite as accurate though but not bad, considering.
I have yet to run into anyone that has actually had a problem with a Universal that wasn't the owners/operator's fault.
Things like feeding it hollowpoint, soft lead nose ammo, not allowing the bolt to move forward under its own spring tension on the first round or insisting on using the magazine as a forward grip.
They were meant to be fed with a semi pointed fmj, 110gr bullet. I've yet to see one fail to feed these, as long as the mag wasn't being held onto.
I had to polish the feed ramps on mine to feed lead bullets. After that not a hiccup.
IMHO, if you can get one at a reasonable price, go for it. They are a lot of fun. If you can find one with a non restricted length barrel even better.
By the way, almost all of the parts for it are relatively easy come by as they interchange with surplus GI parts.