Here's a question: When th emag is outside the gun, and you are about to shove it in, previous to that have you pulled the trigger at all? In order for that gas release linkage to retract, the slide needs to be pulled back and released. Otherwise, that release linkage is going to be wating for the slide to cycle before it retracts, and you rputting the mag in when it's latched forward will press on the mag's release valve.
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