MAGAZINE MR556 5.56MM 30RD 251770S Manufacturer Model Number: 251770S Manufacturer: Heckler and Koch (HK USA) Model: MR556A1 Magazine Caliber: 223 Rem | 5.56 NATO Type: Accessory-Magazines Item Type: Accessory Firearm / Accessory Capacity: 30 Shipping Weight: 0.55 Feature: Also Fits SA80 & HK416 Feature: Steel Construction Optic Adjustable Objective: false Optic Reticle Illuminated: false