The C1A1's weak point was the butt stock. Ergonomics. If you didn't have the right length for you(4 lengths. Short, Normal, Long and Extra Long), you got pounded on the cheek bone. With the right stock length, you could shoot it all day, every day, with no pain anywhere. The rifles didn't break though. Mind you, a tine on a flash hider broke one day. Not sure why. And a safety wiggled loose another. That one fire two rounds FA and jammed. Pushed the safety back in and it kept going. The rifles were 40ish years old at the time.
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