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AR-10, I don't think the pin is the problem. It sounds more to me like either a short firing pin, excess headspace or as you mentioned gunk in the firing pin recess. Reversing the pin may or may not result in a loose fit. I wouldn't expect it to but you never know. The recoil plate should come out but I don't remember if they are threaded or not. I don't think so but you might want to check with Colt first. Before all that load your cylinder, get a feeler gage with removeable leaves and insert the .005" leaf between the forcing cone and the front of the cylinder then measure with the feeler gage leaves to determine how much distance there is between the cartridges and the recoil plate/shield. If this exceeds .008" you have excess headspace and it needs to be looked at by a smith. George
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