The Bulgarian 'waffle' mags are steel-lined at the top, meaning the feed lips and both latching tabs (front and back). So they are about the only plastic ones I am sure are good enough. But I haven't seen any sold in the last few years.
I have got a few Finnish plastic mags with aluminum latching tabs which may be good enough.
The US Palm ones seem very solid but I am not sure if they latch into the gun with metal to metal contact.
Bart Noir
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Be of good cheer and mindful of your gun muzzle!
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