The trigger is tripping and the safety blade is working as designed. You probably have the trigger pull set to low. Try adjusting the pull weight up a bit. What's happening is the sear is disengaging from the trigger and the safety blade is catching the sear before the gun can fire. The other thing with the 12 year old is he was pulling the trigger from the side and not fully pulling the blade back. You must pull straight back to fully disengage the safety blade.
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