Are these a no-brainer upgrade or do they only really help Full Auto’s? I know they prevent pin walkout and the wear of pin rotation in a full auto AR/M16 but what’s the chance of a Semi Auto AR having these symptoms?
Thanks.
I think it would be more of a reassurance, I’ve never had a pin walk out on my ar’s, and my friend (Class 3 SOT) has never had any pins walk out of his various full auto m4s. If you got the dough to spend why not?
Cheap insurance. I use them because I’ve seen it happen. They aren’t very expensive so I say why not, just in case.
The pins on my first AR walked out fairly often. Not far enough to cause any problems, but they would stick out after every range trip far enough that I could push them back in…
Well, I guess the M&P and Armalite are getting a set for christmas! 
Plus, they just look really good too.
where did you get the bolt release lever at that is inside the trigger guard?
Magpul B.A.D.
Appologies to Ridge Runner 5, for stealing his question. 
lol it does not look like the BAD, but is a similar design, that one looks to be made from round mateiral the bad appears to be flat stock maybe just the photo?
Not needed. Pins don’t just walk. They do so because either the "J"spring in the hammer is worn or damaged or something is out of spec or assembled improperly.
I would even go so far as to say most problems are caused by either crappy parts or people who disassemble their lowers improperly and pound on the pins.