Have had the same thing on my ones ,,,my .223 had a couple of misfires and and was rusty between the firing pin and the rear sleeve ,,,,also polished out the factory machining marks at the rear of the firing pin as the sleeve can stick on these ,,,,i tried a heavier mainspring that is sold as an upgrade for misfires and better halfcocks ,,,,but have taken out as created a pretty heavy bolt lift,,,,,since sorting the rust as Madjon brought up and sorting the firing pin has been great
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