This is an AR-15 42-Round Extended Magazine in 5.56mm/.223 Remington
The new and improved AR-15 Magazine features a stronger Polymer Body for longer service life and greater resistance to damage than the traditional, aluminum bodied AR-15 magazine. The Enhanced Anti-Tilt Follower and Chrome Silicon Spring contribute to reliable feeding, even after long term storage fully loaded or prolonged use. Made in the USA to Military Specifications, these AR-15 Magazines can be counted on to perform reliably at the range, in competition, or in the field.
Caliber: .223 Remington/5.56mm NATO
Capacity: 42 Round
Material: High performance Polymer
Follower: Polymer Anti-Tilt (Black)
Spring: Chrome Silicon
Fits: Standard Pattern AR-15 Rifles and similar clones chambered in .223 Remington or 5.56 NATO.