I just bought my 1st glock. The trigger pull is nice and smooth until the last bit right before it breaks, it's a little spongey. I dont want a lighter trigger pull all the way through, but to smooth out the last bit. Someone told me that I can use a microfiber cloth and some metal polish to polish one of the steel parts above the mag (I don't know what that part is called), and that it would smooth the trigger pull. What do y'all recommend?