Hey thanks alot for all the input !! Im trying to get time to explore all the options for failure that have been mentioned and get some feedback for your questions. I can tell u now that yes it was built with lower and upper from different companies,and is a glock mag lower.The trigger is one that came in the pistol build LPK as part of the kit.I will post more info as I explore these options. I also have 2 brands and capacity mags of which one will hardly ever feed a rnd into chamber and the other feeds without fail.but trigger reset is problematic with both. Will update soon.