This is a ProMag® 42-round extended magazine for AR-15 rifles in 5.56mm/.223 Rem.
Get maximum firepower in a lightweight package with these 42-round polymer AR-15 magazines from ProMag! A masterpiece of ergonomics, function, and firepower, the modern AR-15 is a must-have for practically any serious shooter’s arsenal—along with plenty of magazines to keep it fed. ProMag magazines are designed to the highest specifications for maximum reliability with AR-15 rifles. These magazines are built from ultra-durable yet lightweight Zytel™ polymer, with heat-treated chrome silicon spring internals and textured gripping surfaces for easier handling. Unlike higher-capacity drum magazines, these extended magazines don’t require any special winding or maintenance. They work and load and shoot just like your standard capacity magazines, so they’re great for any and all shooters.
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