Kraigwy is correct, a bent follower rod cycles the op rod catch and the clips unlatch early. I may add a couple of other possibilities, the follower rod forks are excessively worn, the clip latch spring is weak or short, and lastly the operating rod catch depressor arm was altered or damaged.
Another good book is the Kuhnhausen "The US .30 Caliber Gas Operated Service Rifles, A Shop Manual, Volumes I & II"
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