Did not fit - Ballistic Advantage Glock 19 Gen 3-5 9mm Luger Threaded Pistol Barrel

The finish and quality of the barrel seem pretty good. However, the barrel did not fit in my Glock 19 gen3. To make sure, I tested it in a Glock 19 gen5 and it also did not fit. When inserting the barrel into the slide, the block does not fit into the ejection port. I'm not a gunsmith, but it seems to be a quality control issue with the milling of the product. Definitely bummed to have to send it back.