SOURCE: My Remington model 7400 semiautomatic 308 rifle
All Remingtons of this type have this problem burnt powder and oil mix to stop everything up but it is an easy fix, Remove the two push pins that hold the trigger group in and pull trigger and all out. put it in a container of kerosene and let it set over night take it out and clean it up good and put it back in. It should be good as new
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