Detachable mags are fine, just expect to have to fiddle with them a little to get them to fit/feed properly. With a yugo you would be better off practicing and getting proficient with stripper clips. But if you insist, I've found that the TAPCO 20 round duckbill magazines are the least...
A couple of my favorites.
http://www.youtube.com/watch?v=ghXatUGIi9g&playnext=1&list=PLAF703855C9CF9AF5&feature=results_video
http://www.youtube.com/watch?v=Za-1E89j6cU&list=PLAF703855C9CF9AF5
He was in the episode where they were helping the prisoners clear out their own cell block. When he ran off, Rick locked him outside and said that he had better run.
Thanks! I actually bough that gun from a buddy of mine. He said it was missing some parts so i took a look at it and it was missing about 1/2 of the slide stop pin (the half with the release trigger on it, the other half was somehow in place). So, he shot me a price of $90. I brought it home...