MA Lock



NOTE: We DO NOT ship MA Locks to NEW YORK.

The MEAN MA Lock is a shear bolt mechanism designed to lock MIL-SPEC AR-15 and AR-10 magazines in place. Developed for states with intrusive laws requiring fixed magazines, installing the MA Lock makes AR firearms legal and compliant, leaving all your favorite tactical features in place. Installation of the MA Lock provides a true solution to fixed magazine laws, thus eliminating the requirement to register your rifle with your local government.

The MA Lock allows the firearm to conform to restricted state laws when used to mount a 10 round magazine permanently. MA Lock replaces the spring and magazine release push button. The operator removes the magazine push button and spring to replace with MA Lock. Operator installs the bushing then threads the hex shape onto the magazine catch in place of the button. The hex shape is then tightened until the head shears off to permanently mount the magazine catch.

An unintended consequence of the new intrusive fixed-magazine laws is possible compromised safety. With no ability to quickly load an unloaded AR rifle for home defense, gun owners may inevitably choose to keep them loaded at all times. This action potentially puts the people we are committed to defend at risk. The use of a MEAN MA Loader solves this problem and is considered by some as the safest solution for all AR rifle owners. Simply keep your AR rifle unloaded with an MA Loader close by. One quick motion and you are loaded and ready. Please view our MA Loader videos for more details.

International Sales: YES. MEAN sells direct to US customers only. For International customers, please check with Brownells to see if they carry our products in your country. For over 75 years, Brownells has been providing quality Gunsmithing tools, gun parts, and service to the firearms industry.

Note: Patented

WARNING: This product and handling firearms or firearms parts can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm including lead, lead compounds, and petroleum products. For more information, go to


  • Model: AR-15 and AR-10 model rifles
  • Fits: MIL-SPEC Receivers (and most others)
  • Caliber: AR-15 and AR-10 model rifles
  • Finish: Anodized Red
  • This product carries a MEAN Lifetime Warranty! If you have an issue please contact our support department via email at We are here to help!

NOTE: Patent Pending