FAB Defense Ultimag 10R Pentagon Magazine Kit 5 Ultimag Magazines with Five 5 Ultimags 10 Round Black. FAB Defense constructed these Gun Accessories from rugged high-grade polymer and you can use these kits on M16 M4 or AR15 variants. This FAB Defense Ultimag 10R Pentagon Mag Kit features an external coupler that doesn't replace the magazine floor plate. Add incredible tactical utility to your rifle with this FAB Defense Ultimag 10R Pentagon Magazine Kit. Specifications for FAB Defense Ultimag 10R Pentagon Magazine Kit: Manufacturer: FAB Defense Gun Model: M16 M4 AR-15 Condition: New Fabric/Material: High Grade Polymer Magazine Capacity: 10 Round Features FAB Defense Ultimag 10R Pentagon Magazine Kit: Highly ergonomic design. Durable high grade polymer construction. Maintains 10 cartridges limitation. External coupler - does not replace magazine floor plate. Compatible with M16/M4/AR15 variants. Package Contents: FAB Defense Ultimag 10R Pentagon Magazine Kit 1x PMC Magazine Coupler 5x Ultimag 10R Magazines What firearm models does the manufacturer say FAB Defense Ultimag 10R Pentagon Magazine Kit is compatible with? The manufacturer says that FAB Defense Ultimag 10R Pentagon Magazine Kit is compatible with AR-15 M4 M16FAB Defense fx-pmck: Ultimag 10R Pentagon Magazine Kit 5 10rd Ultimag Magazines with Five 5 Ultimags 10 Round Black FX-PMCK