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Odd that many of us who own G36 clones have been unable to duplicate the problems reported by the German press-- not that the 416 isn't an excellent design. I wonder what the Bundeswehr pays for them per copy?
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Germans have a very top-down engineering approach. The boss says, "It must have these features, and meet exactly these specifications." So that's how they design it, even if changing the spec 10% would mean the thing could be 50% lighter/cheaper/more reliable.
Anchoring the trunnion in plastic is a poor design decision likely driven by a top-down requirement that "the gun must be 80-something percent polymer". That's the spec, so that's how it gets designed. Those poor engineers probably moved heaven and earth to find a fiber-reinforced polymer that would perform even marginally in that role.
On the other hand, using a skeletonized metal frame overmolded with polymer in the load-bearing areas would have changed the spec, but corrected the heat-related structural issues with the rifle.