Is there anyone out there that can give me some info on a 990L I have in .357 Sig? Serial # is SAF8374. I've been given several stories on it. One is that S&W made 15 for I.N.S.; Another is that Lew Horton converted 15 for S&W to supply for I.N.S. The factory box tag has "IG NS" following the weapon descriptors, so I'm prone to believe it may have passed through I.N.S's hands at some point. What I'd like to know is who exactly manufactured, or modified it, for them, and what, if anything is it worth?