I know I'm resurrecting a thread from a couple months ago, but one little thing I wanted to pass along regarding Zastava M70A magazines: Walther P38/P1 magazines can be modified to fit the M70A.
I saw the question about if the Walther mags would work in some forum several weeks ago - don't remember which one. Since I have a P1 & a M70A, I checked fit and function. I held a P1 mag filled w dummy rounds in the Zastava, and cycled the slide. The cartridges fed & ejected, and the empty mag held the slide open. So far, so good.
In the last week I got around to ordering a couple of extra P1 mags & they arrived today. Since the P1 has a heel mag release there are no mag catch holes along the sides. Even if my experiment wouldn't work, I could always use them in the Walther.
Using needle files, I filed out a notch matching the M70A mag opening as closely as I could (measure carefully, file slowly). The results are in pics below. Hand cycling for function, it works. The angle of the mag base is slightly different than the originals - not pretty, but it works. I'll need to check it at the range - if it fails I'll report back. So, if you can't get extra mags for your M70A, you can make some from P1 mags.