Folks, I am not trying to be critical of CMPicon, especially because I'm a huge fan of them.

However, I just got done inspecting a customer's recently acquired Field Grade rifle. This was very unusual in that the threads on the barrel for the gas cylinder lock were almost completely stripped away. The only thread that even still looked like a thread was the first one. All the rest going back looked like small rounded bumps. Such threads will not hold a gas cylinder lock and hence the gas cylinder on the barrel.

I'm sure CMP will make this right, but is just an example that even a few bad ones get past their fine folks.
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