BR, thanks for your reply. All the parts were cleaned and oiled, the flat spring is from S&S firearms. The carrier motion is a little sticky like there may be some rubbing. How do I tell if I have the "right" carrier? Sn is in the 185k range. It was not easy getting this contraption assembled, so I am reluctant to do it again, but it looks like it mig.h be necessary. I really appreciate the help.