.......The Sig slide is just over a pound; mine weighed in at 16.4 oz. For a comparison I also weighed some Kimber’s, Spring Field's, and an original 1917 Colt; these ranged from 12.2-12.4 oz. With the Sig being my primary L-10 gun I put some carbide to it and whittled away---now the slide is 12.2-3 oz (the scale bounced between .2 & .3).
.......I let people shoot it next to theirs and the mutual comment is usually about the trigger, short reset, crisp...the usual. Only one person has commented on the weight feeling the same as their pistol (BTW it's stainless).
.......The extractor, after purchasing the pistol I did the usual azz-backwards thing and searched the net for any issue’s and came across the extractor, “…after 300-350 rounds they break”. Sure enough at round 326 it broke and within 48 hours I had my pistol back at home with the so-called second gen extractor in it. I have not had any issues since; I stopped counting rounds after 60K---I also have three NIB EGW extractors sitting in a box somewhere.