I have a mysterious problem with My S_I Competitor. With the solid steel guide rod that it came with it runs great, but I wanted to lighten the front end so I bought an aluminum guide rod from Briley. When I install the guide rod I can rack the slide about three times, each time I rack it it gets a little stiffer then gets to the point where it locks up tighter than a drum. When it locks up I have to beat it off the frame with a nylon hammer. The gun is a 9mm major with a Tru-bor barrel and comp., I've tried several springs all around 9#, I've tried it with and without a shock buff. The button measures within a thousandth or two on both rods, I replicated the angle at the top of the button where it rides against the link pin boss. The take down pin hole is vertical on the steel rod and horizontal on the aluminum one. I'm usually not this mechanically challenged on something seemingly so simple, but this one has me baffled.