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 SIs 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. Features : Allows Ambidextrous Activation of the Magazine Release Drop-In Replacement for ambidextrous Use Comes with Strike Magazine Release Button and Spring Compatible with Standard AR15/M16 Receiver Specs