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LOL you have no clue what you’re talking about do you? Brittle? The lower receiver of the AR-15 was made out of ABS and PLA. It fired 100 rounds without fail. 1000 rounds without fail. 100,000 rounds without fail. So your boast about plastic being fragile is frankly bullshit. BA (Boeing) just 3D printed a entire plane out of plastic. Simenons the German airplane manufacturing company used plastic to make a prototype jet engine out of plastic that can reach Mach 5