Universal Firearms started out in
1950 as Bullseye
1983 Iver Johnson bought it
1987 bought by American Military arms Corp.
I had one that was 1970's made, no USGI parts I tried would fit.
This included the bayonet lug & the top forearm cover, & stock.
The charge handles are also very different.
One of the biggest problems with the Universal's is that some of them fire out of battery. If this happens the bolt exits the action in a violent fashion. This is due to some machining not done correctly.
To test it, chamber a snap cap
Retract the charge handle so that the bolt rotates to unlock the locking lugs, but the bolt doesn't retract.
Pull the trigger.
If it fires you have a problem.
If it doesn't fire, repeat the prosess with the charge handle retracted a little less each time. It shouldn't fire untill the handle is fully forward.