I won't use anything else! - KNS Precision PERMA Firing Pin Retaining Pin

I had my doubts, at first, but now I won't use anything else. One piece with a small fork at the end makes for easy installation and less wear and tear on the BCG. It's great for either the AR-15 or AR-10 Platform...I have one installed in all of mine. It's so much better than the old cotter pin (old school.)