Recently on a camping trip I was switching my slide fire from my 15-22 to my AR. I completely spaced the second spring and retaining pin on the 15-22 (you know the one that keeps the rear take down pin in place so it doesn't just slide out) . Luckily I found them on the hood of my truck and placed them in a baggie for safe keeping. Unfortunately when I got home and was cleaning and reconfiguring my gun, I tried to to put the pin back in. In my stupidity (I'm gunna blame the two beers here) it wouldn't fit so I pressed hard on it thinkin it was just caught on something and managed to wedge it in there. The only way for me to get it out was to place a small rod in there and bang it out. Now the nice round tip has a crater in it and even if it did fit I doubt it would retain well. Do any of you by chance know what this pin is called or better yet have a part # or somewhere I can order one from? Or am I just going to call smith and wesson and pray they will sell me one? I really dont want tape on my gun holding my take down pin in! Lesson learned