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I have an old Remington Model 742 semi auto rifle. I've noticed that when chambering a cartridge, the firing pin is leaving a slight dimple on the center of the cartridge even when it is not fired. If fired, the next cartridge loaded has the same dimple. I keep expecting it to fire upon chambering a cartridge or to double fire. Does anyone have any ideas on what's causing this or how to repair it? Any suggestions would be greatly appreciated.
 

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Remington 742 semi auto "loose firing

Could be a broken firing pin or a bur on the pin or in it's well in the bolt. Most likely and weak firing pin return spring. Also I had one in one day that didn't have a return spring!!!! Guess I wasn't the first to work on that one. It was dimpling pretty badly!! Should not be happening! Good luck from the gunnut69
 
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