These limited-edition lowers are made using the most advanced aerospace manufacturing technology to produce the industries finest, forged Mil-Spec lowers. Our receivers are machined on a multimillion dollar, automated, manufacturing system which enables us to produce a product of unequaled quality and value. 
These forged lowers are quality made using material is 7075-T6 and are marked "CAL. 5.56 MM." to accommodate most builds. The finish is black hard coat anodizing per Mil-8625 Type 3 class 2.  Serial numbers have the prefix of "W-XXXXXX"