Don’t do it! - ZEV Technologies AR .308 Billet Upper, Large Frame, 16in Barrel

Zev Technologies only cares about profit. They do not stand behind their products and couldn't care less about customer service. You would think that paying a premium would ensure a working product. Well, let me tell you that you may as well flip a coin. Zev is well aware of the issues with many of their products, and will do anything to avoid or dismiss any problem. I have been waiting for a month to try and come to a resolution, but have yet to receive any updates on the warranty claim. Mind you this has all taken place less than 6 months after purchase.