Upper won't cycle... - Quarterbore's Forums

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Upper won't cycle...

04-25-2008, 12:44 AM

PTK

Junior Member

Join Date: Apr 2008

Posts: 9

Upper won't cycle...

I'm using a M1S upper, checked and made sure about the gas port, it measures 0.104", the gas tube is good, using a collapsible stock and "carbine" buffer, using 15.4 gr of R7 and a 220gr SMK HP bullet, and 12.4gr of H110 and the same bullet. Neither cycles the action, though the H110 ejects the case further. What am I doing wrong?

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