I sent my AP4 trigger in to Bill Springfield http://www.triggerwork.net/ and had him do the $50 job he offers and it came back quick but looked rough. I honed it up and installed. Works quite decently and breaks quite cleanly at a reliable 4 lbs. consistently and I think I like it. My other AR's have JP's so it had a lot to compete with but overall I am satisfied. For the money I can't bi#@ch!