Honestly I was a bit nervous about how well built this upper was going to be when I ordered it, but after running some drills today I’m very pleased. The quality is outstanding. Everything fits together perfectly and mounted on a bushmaster lower it seems they were built for each other, tight fit with no wobble. The barrel is pretty heavy but that’s to be expected in a steel 20 inch barrel. The hand guards narrow even in the quad sections. I’ve ran cheap brass and some higher end match grade and both have ran flawlessly. Very impressed with alpha. You guys got my business.