We are Quentin Defense, a firearms manufacturer in Gilbert, Arizona. Originally established in 2008, Quentin Defense became a reliable resource for variance manufacturing of billet AR-10 & AR-15 lower receivers throughout the gun community and across the USA. With the introduction of the ARQ line of receiver sets around 2017, Quentin Defense was taking their product line to the next level by offering premium quality precision machined  billet receiver sets in AR-15, AR-10, and AR-9 platforms.