Magpul is one of the Most Trusted Names in Firearms Technology The Magpul PMAG AC/AICS is a reliable and durable polymer magazines built specifically to be compatible with short action Accuracy International Chassis Systems type bottom metal and 5.56 NATO/.223 Remington cartridges. These magazines are built using the GEN M3 technology and feature the latest advancements in both material and manufacturing process. This magazine provides you with a superb value due to the fact the magazine is economical, lightweight and durable. Magpul PMAG AC Short Action Magazine 5.56/.223 Specifications and Features: Magpul Industries Item Number: MAG1100 10 Round, Bolt Action Magazine Caliber: 5.56x45 NATO / .223 Remington Accepts a Cartridge Overall Length of up to 2.39" Next-generation Impact and Crush Resistant Polymer Construction Self-lubricating Follower for Increased Reliability Long Life Stainless Steel Spring Paint pen dot Matrix for Identification Markings Flared Base Plate for Positive Control and Ease of Retrieval Weight 2.7 ounces Height 5.01" Black Fits: Short Action AICS-Pattern Bottom Metal, Including the Bolt Action Magazine Well for the Magpul Hunter Family of Stocks Note: Use with other calibers such as .300 AAC Blackout is not recommended. Note: Not recommended for use in the Ruger American rifle.