https://vizardsgunsandammo.com/promag-ar-15-m16-mag-42rd-blk223rem-5-56x45mm-polymerblack-polymer/?ctk=11bd6f38-b8ce-4533-bb70-8fd3e738d1e8&showHidden=true

ProMag 223 Rem/5.56 NATO, 42rd magazine fits the AR-15 and M16. Made in the USA.

Brand ProMag
Category Magazines
Caliber 5.56x45mm NATO
Model AR-15
Material Polymer
Capacity 42rd
Style Detachable
Model Fit AR-15, M16