I have the advantage of living near a large Military base, I can walk into almost any local gun store and grab everything I need same day if I don't want to wait on shipping. My shop always has the BAD available, never looked for the mag release. I did try an odin extended mag release, what a waste. It works but wasn't necessary for me so now I find that it looks tacky, I have it on my DD right now but plan on putting it on my Sport.
I like my sport but it's the lowest level AR I have and has become the spot where the parts I don't care for end up going.