I've got one of these guys, a star bm in 9mm. Kind of like a mini 1911.
It's got a square cutout on the top left side of frame. Took a while to figure out star did that intentionally as a stress release as 1911's
tend to crack in that spot.
I have fired all kinds of ammo in it with no issues.
This one is kind of neat as it's serialized to the factory box.
I have a super B i inherited a few years ago that isn't half bad as a shooter either.
I think some of that stuff on spanish guns is popo.
Try the cetme, which was designed by germans for the spanish when they were a little bit in trouble after WWII.
And it's sucessor the hk91 or G3.
http://www.gunbroker.com/item/667482169as to parts, i have never had anything break. But i did through another forum get a hold of a guy in spain, that had a lot of parts, and bought a new guide rod and spring.