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Zamak first hit in the 20's or maybe 30"s? So it has been around and in use for very long time and has proven it works. One thing that never changes is QC does matter. Things can be made from Steel and be crap if not done well. Springs come to mind here. How often do you read people telling others springs will "wear out" from being kept compressed. When you tell them that if they do "take a set" they were just not made correctly. Many refused to believe it.I paint some winch parts at work that are zinc castings and survive in Military use environments. The two pieces to the left and right of the steel wire spool are zinc castings and the end housing on the far left is also a zinc casting. i think you are right about who does the casting. I am not worried about my hi point slide breaking down anytime soon.
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I have some mags that for some reason do not know they are supposed to have died long ago. One a German made .25 that originally belonged to my Grandfather. That mag has been loaded for almost as many years as I have been alive. Ever few years I take it out to shoot a few times and for some reason the mag still works even though many have told me it can't. Have some 1911 mags that have been loaded for many decades. They also don't know they are not supposed to work. Bottom line its mostly about quality control. RG was famous for making crap and I would guess it had more to do with the lack of QC than what they were using to make the guns. Those HP carbines have a lot of plastic in them that I would guess is some kind of polymer. They too have been going for a hell of a long time and I don't see people having one suddenly break. So I have to guess that stuff too can be made to last if done correctly.