CMMG is making the AR more left handed friendly with an ambidextrous magazine release. Great for left handed people of those that want the flexibility if the need to shoot left handed around a corner and change magazines occurs. It is made to simply replace a regular magazine release and add left handed function. Includes everything you need except tools to get shooting left handed.CMMG AR-15 Ambidextrous Magazine Release Specifications and Features:Manufacturers Number 55AFF6ECompatible with all AR15/M16 riflesInstalls the same as factory mag catchIncludes mag release button and springBlack