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I check my crown by sticking a clean Q-tip in about a 1/2" to reflect some light back out and look with an eye loupe for burrs or dings. This is how I look for copper deposits too. Removing the suppressor and trying another scope would be my first bets like Pug and Artful said. I had a weld break on a .223 can which tweaked the groups in a mostly horizontal spread, hopefully its the scope. If it is the can/mount be glad you have a Gemtech, they will take good care of you. My weld broke because of abuse by another shooter, I don't share my NFA anymore. The newest Gemtech G5 mount is mostly titanium and is very nice.
Last edited by jarhead1086; 05-01-2008 at 01:54 AM.
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