Hello, this is a used blued HK USP 40 caliber compact model 3.58 barrel & guide rod assembly. Ot for any other make, model, or caliber and not for the full size model. Bore and rifling both look pretty decent overall. 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.