Brownells 75th Anniversary - A Shooting Heritage

The patent-pending MXR® is primarily chambered in 9mm NATO and is caliber convertible at the user level without tools to accommodate 7 different calibers. Supplied with Glock® pattern magazines, the MXR® Pro is also convertible at the user level to accept common pistol magazines from a variety of manufacturers.

Engineered and produced in the USA of aerospace grade materials combined with high-impact polymer components for a lifetime of hard use in abusive environments; the MXR® Pro features MIL-STD 1913 rails at the 6-12 o’clock positions and M-LOK interfaces at 3-9 positions of its monolithic receiver for optimum strength and accessory retention.

Featuring reliable, time-proven blowback operation from a closed bolt and a quick-change threaded barrel for suppressor use; the MXR® Pro can be field stripped in seconds without tools to provide for easy takedown and maintenance. Further customization is provided with the MXR® Pro’s use of AR/M4 compatible fire control group, grip and receiver extension tube interfaces to suit user preferences and ergonomics.

  • Plain Buffer Tube
  • Caliber: 9mm NATO
  • Weight: 3.25-3.75 lbs.
  • OAL: 16.25” to 22.75"
  • Barrel: 5”5” to 7" 1/2 28 TPI
  • Grip: High Impact Synthetic Polymer (model shown)
  • Handguard: Aluminum alloy, Magpul ® M Lock
  • Magazine: Glock Pattern
  • Origin: 100% Made in the U.S.A.


  • Magazine,
  • Chamber Flag
  • Rifle Lock
  • Muzzle Thread Protector
  • Operator’s Manual


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