The QUATTRO-15 Loadout Kit is a must-have for owners of the QUATTRO-15 Lower Receiver. It comes with the QUATTRO-15 Magwell Adapter Kit, allowing QUATTRO-15 Lower Receivers to accept standard AR pattern magazines. The kit also comes with (4) 53-round QUATTRO-15 Magazines. The benefit of this configuration is the ability to carry more ammunition with fewer magazines. For example: four QUATTRO-15 Magazines can hold 212 rounds, while seven standard magazines will only hold 210 rounds. This translates to more shooting and less reloading. To overcome the issues often faced by quad-stacked magazines, the QUATTRO-15 Magazine utilizes a simple yet highly reliable single follower and a single spring design. Features: QUATTRO-15 Magwell Adapter Kit: Allows QUATTRO-15 Lower Receivers to accept standard AR pattern magazinesQUATTRO-15 Magazines: 53 round capacity Desert Tech Quattro-15 Loadout Kit w/(4) 53rd Quadmags & STANAG Adapter QTR-LK-B53