So I took my Glock 19 Gen3 to the range yesterday to have a little fun. However it ended up being a trip of trying to figure out what was going on with my gun. First shot out of the gun was one pull of the trigger and BOOM BOOM gun went off twice. Thought to myself thats odd pulled the trigger again and same thing two shots with one trigger pull. Needless to say it continued to happen off and on the rest of time I was there. A few mags ran flawlessly some were half and half some were all double bursts. Has anyone else ever had this happen or know of what could be the possible cause of this?