![Laughing :lol:](./images/smilies/icon_lol.gif)
That piece didn't come in there and you don't even need it. I use them "just because" but I've never had a failure due to NOT having one.
I don't recommend them on a defensive gun though. The things can CAUSE malfunctions if they fall apart which aparently yours did.
I have some and will mail you a few if you pm me your mailing address.