I have finally got around to printing a SS and doing all necessary modifications to make it work for my SL15 printed lower , safe works fine and semi works fine , but when I'm in the third position the trigger acts like it's in safe then all the sudden will throw 3 - 4 rounds fine then jam up again , I have to re-rack the slide and then fiddle with the SS and kinda put pressure on the trigger until it decides to do another burst and then I have to repeat previous stated steps to get it to work , any ideas on how to fix it ??