AR-Fu: A Tale of 3 Magazine Releases Recently updated !This entry was posted in Gear Gun Parts Gun Parts Gun-ology Guns Gunsmithing MSR Reviews and tagged ar-15 Arrendondo gun building Magazine Release Button Power Custom on March 23, 2017 by Luke Stephens (Head Gun and Gear Guy) AR-15 magazine release buttons are often overlooked improvements in gun builds. In this post. we review 3 variations in this component, including the standard button. Find out what we decide. By the way, we find one product that is defective!