The 22s (at least Sig and GSG anyway) use 'Zamak 5', while Hi-Points use the weaker 'Zamak 3' and obviously fire much higher pressure ammo, so the 22s aren't as shit as Hi-Points.
The only thing I don't like about the 22/45 is how the mag inserts at a different angle to the grip, but they are better guns than any of the look-alike 22s.
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