Hello, this is a used HK USP 40 caliber compact model black slide. Barrel length that fits it is 3.58. Ot for any other make, model, or caliber and not for the full size model. Includes upper parts like firing pin, extractor, sights. Does not include barrel, guide rod assembly, or any extras. I believe serial code puts it at year 2000 manufacture so recommended to be used only with frames and barrels from around that time. Has a decent amount of exterior scratches and finish fading but still a good usable part. Please see pics for more details. Any questions, feel free to ask. I do my part to get the item to you quickly but I do not, obviously, control the speed at which the carrier delivers it. So if your item is late, please have some patience, thank you.