Posted: 9/5/2008 5:51:45 PM EDT
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just got a new barrel from CMMG. But I cant knock out the damn pins on this one. It mushroomed up pretty quickly. So I grinded down the side with a dremel. Still wont budge. Bent my punches on it. will probably send it back to CMMG and have them remove it for me.  
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With the risk of sounding like an asshole are you punching them out the right direction? They are tapered on most uppers and they will only move one way. I had someone bring me a upper not to long ago with the same "type" of problem. After looking at the mushroomed end I turned the upper over and punched the pins right out. Next option would be a using some heat. Got a propane or mapp gas torch on your bench? |
Yes, I'm confident they are being punched in the proper direction. I didnt measure it with a caliper, but from eyeball, they were pretty obvious to me. And not to mention, it's the same direction as my used CMMG barrel. No torch. Right now, I cant even tell where the pins are on the left side. The finish is gone. I'm just eyeballing where the pin should be. A local shop is willing to try it out for $35 on Mon. |
Right on...It should be pretty obvious which way they go if you "know" they are tapered. The guy who brought me his upper had a Model one upper that had straight pins in it before he boogered up the one I speak of. He assumed his new upper was the same. Would gladly help you out but I am a ways South as Coctailer said... Good luck... |
You toss the barrel into the freezer, and the different rate of contraction of the barrel, FSB, and FSB pins should make it easier to remove the pins. |
