Was that bedded from the factory?Proper assembly from any factory is important to check. CA doesn't have the best reputation so extra important to double check the basics.
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I am sure if the crap bedding job was redone this would have solved the 3" groups because it shot about an 1" once dropped into a KRG Bravo.
However, CA recommendation was to grind the barrel channel away from the barrel which is about as stupid as it gets.