Here is the solution. Go to Junk Yard Genius.com AR-15/M-16 Pages, page 1. NOTE, substutate the 1/20 threaded 1/4" to a 1/28. S&W used a different thread than normal. I had about 1/8" of creep that was like dragging the sear over rough sandpaper. No I have no creep at all.