Load a smooth-feeding Brownells 30-round AR-15/M16 magazine to maximum capacity and fire all the rounds--no jams, no misfeeds, no hangups. All components are manufactured under strict ISO quality control standards from top-quality mil-spec materials. The heat-treated, welded aluminum body is hard-anodized for superior corrosion resistance, then given a tough, dry-lube coating to eliminate the need for additional lubricants that attract dust, sand, or dirt. The latest military-type glass-fiber reinforced composite follower further guarantees flawless feeding in the harshest operating conditions. The high-lubricity, dry-lube coated chrome silicon spring is corrosion-resistance certified to 500-hour salt spray standards, and resists taking a “set” when a fully loaded mag is stored for a long time. The same updated material and design features have been adapted to our straight-bodied, 20-round model. With our combo-pak deal, it's easy to make sure you have plenty both sizes on hand--and still have some money left over for ammo!