Strike Industries AMBI Magazine Release, Ambidextrous, Fits AR-15, Black SI-AR-AMBI-MR-BK Strike Industries AMBI Magazine Release drops into any receiver designed to accept a Mil-Spec magazine catch. Low profile" and ergonomically designed" the mag-catch integrates with most receivers while being very easy to use and will not accidentally activate or interfere with other controls. The package also includes SI's enhanced Strike Magazine Release button and spring for a complete drop-in upgrade. For left-handed folks or for those who just want more options" the Strike Ambi-Mag Release is the perfect component to have.