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15,098 Posts
I would suggest a picture with the upper removed along with the bolt, from the bottom up.
Also a picture of this "roller cam pin". I'm not familiar with this improvement, and wonder aloud, if it would require a special upper receiver or not.
My gut reaction is why is it needed... the cam pins function is to connect the bolt to the carrier. It has a "rectangular" head to allow insertion into the bolt and carrier, and once in rotated 90 degrees to allow the firing pin to pass through, and with it turned 90 degrees, it cannot come out, even if the firing pin breaks in half because of the "rectangular" top.
If someone can explain what the purpose of the "roller" is, maybe I can understand its improved function.
Also a picture of this "roller cam pin". I'm not familiar with this improvement, and wonder aloud, if it would require a special upper receiver or not.
My gut reaction is why is it needed... the cam pins function is to connect the bolt to the carrier. It has a "rectangular" head to allow insertion into the bolt and carrier, and once in rotated 90 degrees to allow the firing pin to pass through, and with it turned 90 degrees, it cannot come out, even if the firing pin breaks in half because of the "rectangular" top.
If someone can explain what the purpose of the "roller" is, maybe I can understand its improved function.