I recently acquired from GunBroker.com a Mil-spec 5" that was advertised "like new". When I received the gun, I noticed that it has the vertical serrations and low-profile sights of a GI model. Was there a time when the mil-spec did NOT have the slanted cocking serrations and 3-dot sights, or did I get screwed? The serial number on the frame matches that on the label on the box, which says it's a mil-spec pistol. I'm thinking the slide has been replaced.
Also, the lands in this barrel seem to have a significant amount of wear. Is it possible to wear a barrel with 'less than 100 rounds fired'? Seller says he fired cast lead rounds and that should explain the wear. Does that make sense?