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I've sold quite a few Plum Crazys without a complaint coming back, and for sure I'd have heard them considering some of whom I sold them to. I'm going to need some convincing on these. Some research to come.
I have personally put plastic and polymer specimens in a universal testing machine and they never truly break. Polymers have an elastic region way longer than any metal on a stress-strain diagram. This means if it gets strained it has the ability to return better than metal, just like he demonstrated in the first video. The only advantage metal has to polymer is scratching which can be cured by a hard coating like duracoat.
I know poly works fine in handgun lowers and own several but they all have some version of a metal internal chassi.
I'm very famiar with the AR platform and understand that the process of firing puts very little if any strain on the lower receiver. I'd be more concerned with lower functions like the trigger group, mag release, and bolt catch functioning reliably over time if they were attached to poly rather than alum or a metal chassis.
Light weight complete polymer AR-15 Lower - $100
Linear Mode
