Just picked up a Serb AK and am looking for inexpensive magazines that work in the M70. I see U.S. Palm plastic magazines selling for 9.95. Do these function ok? I don't intend to go to war with the gun, just have some range fun. The same site has Bulgarian metal magazines for 12.95, but using them causes a 922R violation since the magazine is three of the magic parts. How about Magpul brand AK gen 2 magazines?