Wayyyyy back then .... you remember when the A-Team was still in its original run, right? Well, at that time Uzis were still very rare in this country, and they also were new enough to be seen (by Hollywood, at least) as cutting-edge technology.
Importation of full-auto weapons for civilian ownership was banned in 1968; after that, anything that came in was a nontransferable dealer's sample. And even dealers had a hard time getting them, because imports were being limited by the U.S. and at the time Israel was the only producer, and they were keeping and using every one they made.
As recently as 1985, when Colt factory M16A1s were selling for $800, a registered full-auto Uzi was worth $4,500, andyou could buy a full-auto MAC10 for under $200. So the movie-gun companies charged way less to rent look-alikes than the real thing.