The PMAG 5 AC L is a durable, lightweight, high reliability 5-round polymer magazine designed for .300 Winchester Magnum style cartridges (.257 Weatherby, .264 Win, .270 Weatherby, 7mm Rem, .300 H&H and others). This magazine is compatible with long action AICS (Accuracy International Chassis Systems) pattern bottom metal. It features a flared floorplate for easy disassembly, impact/crush resistant polymer construction, and a self-lubricating follower for the performance you expect from a PMAG. Made in the USA Please note that this magazine is NOT compatible with .404 Jeffery based cartridges, Remington Ultra Magnums (RUM/RSAUM), or Winchester Short Magnums (WSM/WSSM). This magazine can accept cartridges with an overall length of up to 3.50".