Featuring durable polymer construction the FN Five-seveN 5.7x28mm 20-Round Factory Magazine is built for lasting strength and durability. This factory magazine boasts numbered witness holes for quick reliable round counts on the fly and removable impact-resistant polymer baseplates for easy cleaning and maintenance.The durable polymer follower and high tensile steel spring ensure smooth reliable feeding every time in high-stress target and tactical environments. Constructed primarily from their high-strength polymer and chambered in a proprietary purpose-built round the Five-SeveN set a new standard for lightweight firepower.This FN Factory Five-SeveN magazine plays a large part in that innovation; packing a massive 20-round capacity without having to deal with finicky extensions or baseplates these Five-SeveN mags offer incredible capacity without giving up any reliability. Order today!