The X-Bolt rotary magazine is among the lightest most reliable and durable on the market. These magazines are so innovative they have been granted three separate patents. The sturdy polymer construction is designed to endure the punishment that will break lookalikes from competitors. Always keep an extra magazine (or two) in your pocket to facilitate a quick reload when it counts.Features: Detachable rotary magazine constructed from a durable lightweight polymer Feeds cartridges directly in line with the bolt instead of offset as with traditional leaf-spring magazines for a straight path right into the chamber Ergonomic magazine-mounted release Magnum caliber holds three cartridges Standard caliber holds four cartridges