The serial numbers on the slide and barrel are matching starting with LWG. This slide comes with regular Glock factory sights. Please note some of the discoloration on the slide is the protective film from the ultrasonic wash that can be wiped off. Slide Stop Release with Spring. The item "Factory OEM Gen 3 Glock 23 Complete Upper Slide w LPK Parts Kit for P80 GEN3 LWG" is in sale since Wednesday, December 16, 2020.This item is in the category "Sporting Goods\Hunting\Gun Parts\Pistol". The seller is "dvsdev" and is located in San Marino, California. This item can be shipped to United States.