Cloak Industries 100 Round 5.56x45mm NATO Plastic Nutsac Black. 56 ammo belt holder. Holds up to 100 rounds of linked 5.56. Compatible with the M249 and other firearms using the traditional M249 style ammo box retaining clip. Includes a required AR-15 magwell adapter to be utilized with the MFR56. Specifications for Cloak Industries 100 Round 5.56x45mm NATO Plastic Nutsac: Manufacturer: Cloak Industries Color: Black Fabric/Material: Polymer Number of Rounds: 100 Dimensions: 11x6x4 in Caliber: 5.56x45mm NATO .223 Remington Weight: 0.5 lb Package Contents: Cloak Industries 100 Round 5.56x45mm NATO Plastic Nutsac AR-15 magazine well adapter Cloak Industries CLK-100-PNS: 100 Round 5.56x45mm NATO Plastic Nutsac Black