The science of materials has come a long way in a hurry. Polymers now exist that can rival steel in terms of their durability...
Good point but those polymers aren't the ones they're building guns with, otherwise none of us could afford them. You wouldn't be able to stipple them with a soldering iron, either. Face it, gun plastic is fairly low-quality considering the vast array of possibilities. It's basically thick milk jug material.

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