Diamondhead USA, is a West Springfield, Massachusetts company. We are nationally known and respected as a leading design innovator, manufacturer and distributor of top quality accessories for the M4/AR15/AR10 platform. The original Diamond Sights with the patented Diamond-shaped Apertures and Diamond-shaped upper housings launched our company in 2010. At Diamondhead everything is USA made and Lifetime Warranted. We are dedicated to offer the most innovative, reliable and cost effective products and support them with exemplary, industry-leading customer service.