well. from waht i can tell all the tiny parts in the trigger box are steel. upgrading all thsoe tiny parts of the trigger box to steel will set you back for quite a lot already if im right. also im in love with the idea of being able to adjust the trigger and ALSO the hammer (in case weather gets too hot i can increase the hammer strength to compensate the higher pressure of the gas from the magazine. I also have a soft spot for flat trigger lol