Luth-AR M16 .223/5.56mm A1 Upper Receiver Part Hard Coat Anodized Black. The M16A1 adopted in the late 1960s was designed to be a lighter and more reliable weapon than the M14 it replaced. Its development and deployment in the Vietnam War and the subsequent modifications to address early issues solidified its reputation and made it a standard issue for U.S. troops. It has since transitioned to civilian use favored by enthusiasts collectors and competitive shooters. Beyond its historical significance the M16A1 upper receiver continues to be relevant today. It is because of this that Luth-AR has decided to add it to its family of Retro Upper Receivers. For those who appreciate the classic look and feel of the M16A1 additional reproductions and original parts are available to build or restore M16A1 clone rifles. In essence the Luth-AR M16 A1 Assembled Upper Receiver represents a blend of historical importance engineering excellence and functional adaptability. Specifications for Luth-AR M16 .223/5.56mm A1 Upper Receiver Part: Manufacturer: Luth-AR Color: Black Finish: Hard Coat Anodized Fabric/Material: 7075-T6 Aluminum Caliber: 5.56mm .223 Remington Gun Make: Colt Gun Model: M16 Muzzle Device: No Features of Luth-AR M16 .223/5.56mm A1 Upper Receiver Part Luth-AR Exclusive Stacked DC Forge Mark Forward assist lug No deflector No M4 Feed Ramps Package Contents: Luth-AR M16 .223/5.56mm A1 Upper Receiver Part A1 Rear Sight Assembly installed A1 Port Door Cover Assembly installed Teardrop Forward Assist Assembly installed What firearm models does the manufacturer say Luth-AR M16 .223/5.56mm A1 Upper Receiver Part is compatible with? The manufacturer suggests that Luth-AR M16 .223/5.56mm A1 Upper Receiver Part is compatible with M16Luth-AR UR-01-M16A: M16 .223/5.56mm A1 Upper Receiver Part Hard Coat Anodized Black