Rod B
CGN Ultra frequent flyer
During the 70's and the 80's, the German firm Erma made a lot of pot metal alloy rimfire firearms of all kind...
For the particular failure of this thread, a poor quality control might be the cause too... poor engineering or material mignt not be alone the reasons.
EX

I had an Ithaca '72 in .22WMR, it was made by Erma Werke & it did indeed have a receiver made of a zinc alloy (pot metal). I had no problems with the durability of this rifle.
Henry who makes a similar rifle also uses this type of metal & they enjoy an excellent reputation.
It would appear that engineering & quality control play a huge part in determining the reliability/durability of a firearm.
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