I have three of the short 5 round promags (10 round pinned to 5) for my scoped "hunting" SKS. With the Magwedge rail, removable mags just make it easier than top loading one round at a time.
As other's have mentioned, it took a bit of sanding on the sides to get them to slim down enough to fit right, but they've been worry free ever since. The nice thing about the short mags is that they keep the same lines as the original box mag. Clean, handy rig for bumping around the bush looking for a white tail.