These robust, all steel, high-capacity magazines are designed for 9mm AR-15 conversions utilizing a Colt-style magazine. The metal follower is engineered to resist distortion under full load, ensuring smooth and reliable feeding. The hold-open feature is compatible with ARs equipped with a hold-open mechanism on the conversion block. The easily removable floorplate facilitates quick and straightforward disassembly. These magazines are compatible with Colt and Rock River conversions that include a lower receiver conversion block. The product features a robust all-steel construction specifically engineered for 9mm AR-15 conversions, compatible with Colt-style magazines Incorporates a metal follower to ensure smooth feeding and includes a hold-open feature, compatible with ARs equipped with a conversion block Equipped with a removable floorplate for swift disassembly, this device features a 32-round capacity, ideal for prolonged shooting sessions