The main reason for polymer frames on guns was initially a cost thing, not a better quality. Several improvements have reduced wear, and increased reliability.
One has nothing to do with the other. Replace my polymer frame with an aluminum alloy, Steel rails, and it will be the same as far as reliability, just weigh differently.
Designs have changed to reduce friction that caused more wear as well as the material used. Also drop-down barrels improve feeding.
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If you ever have to use a firearm, you don't get to pick the scenario!
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