The Ultimag 10R is a high grade, extremely reliable 10 rounds polymer AR15 magazine. The Ultimag is designed for use with the Fab Defense 10R Pentagon and Dual Magazine kits. Features: Ergonomic design made for enhanced grip and faster magazine change Specialty made floor plate for specialty-made coupling options Dissembled by hand, no tools needed Made of durable, light weight, polymer composite and steel Highly-reliable construction, built to last Palmetto State Armory is your top choice for tactical accessories and gear from Fab Defense and other top manufacturers!