The Quattro-15 is the next evolution in AR-15 design, utilizing the increased capacity from the QMAG-53, 53-round polymer magazine. The flared magazine well supports a quad-stack to double-feed magazine. A magwell adapter kit allows the use of traditional 30-round magazine and provides backwards compatibility with STANAG pattern magazines. The Quattro-15 Lower includes an Ambidextrous Bolt Catch, Magazine Release, QD Sling Point, and upper receiver tensioning set screw. With compatibility with parts from across the AR-15 market. Machined from a 7075-T6 Aluminum Forging, and finished with a Type III Hard Coat Anodizing

The QMAG-53 is a single spring, single follower quad-stack to double-feed magazine, with a capacity of 53-rounds total. Users and operators can carry more than the 210-round ammunition requirement set by the US Army with only 4 magazines. And the QMAG-53 will fit in any double sized magazine pouch! Each magazine, spring, and follower is inspected tested and tolerance gauged during manufacturing to ensure maximum reliability!