Black Creek Labs MRX Bison 5.56 Nato 20 Round Bolt Action Magazine

Availability: Out of stock

The MRX Bison is the only rifle in the world that feeds from both a proprietary 20 round bolt action magazine and an AR15 magazine. The ability to function with any AR15 magazine gives the user an almost infinite number of options for magazine brands, capacity, material and style. Alternatively, “The MRX MAG” gives the user a 20 round capacity in a magazine that is specficially designed for the MRX Supershort Action and will not fit or function in an AR15 or any other semi-auto

The MRX MAG is a double stacked, straight magazine made from a proprietary blend of polymer. The MRX MAG has extended length feed lips and a no-tilt follower design that allows ultra smooth and reliable feeding. The MRX MAG uses “follower stop ledges” which keeps the follower from topping out, which allows the MRX Supershort bolt to be manually pushed forward when the magazine is empty and still in the rifle, which is not possible with an AR15 magazine.


  • Made of high strength polymer
  • High Strength stainless steel spring
  • No tilt follower design with stop ledges that prevent the follower from topping out
  • 20 round capacity allows the magazine body to be a straight design without bullet binding
  • Mag body shape will not allow it to fit into an AR15, but will allow for a sturdy, tight fit in the MRX Bison and MRX Jackal
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