Mega Arms manufactures premium billet AR receivers in Bellevue, Washington. The MATEN (pronounced MAY-ten, standing for Matched AR Ten) is a matched billet upper and lower set machined from 7075-T6 aluminum to tighter-than-mil-spec tolerances. The zero-slop receiver fit improves accuracy over standard AR-10 builds. Mega sells the receiver set widely as the premium choice for custom AR-10 builders. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm NATO Capacity: 20 Year introduced: 2011, USA Weight: 108 oz Overall length: 37.5" Status: Active Intended use: precision, sporting, competition