SKB, good info. Thanks. Question? As the extension is integral to the entire rib on this gun, how would the rib have been installed with different solder and higher temps? I am not a gunsmith. On other SxS I observe that the rib is separate from the rib unit which would allow first silver soldering in the extension along with the barrel lug as a separate action and then laying in the rib itself at lower temperature. Curious?