I've got the CSA one on my Vz58 5.56 right now.
It does not take the current metal robinson arms mag's I have. Have not had a look into why the bolt is catching on it (cannot even pull it back fully while a robinson mag is in).
I like it.. It wiggles a tiny but but so far so good. Running 5/30rd Gen3 pmag's in it now with no issues.