I got a Polish underfolder kit from Cheaper Than Dirt and it doesn't have the hammer, trigger, or disconnector. I'm sure I have all the springs, but those 3 things are missing. I sent them an email and am still waiting for a reply. I'm looking for a cheap set to test for function before I drop the dime for a nicer set. I have lots of stuff to trade as well, I might have something of interest to you.