lost firing pin retaining pin.

[QuadCam]

So, they're not just a cotter pin like you get from the hardware store?

I've never had to replace mine and always just assumed that if something happened to it, I could buzz into the Hardware Hank and buy a stainless steel cotter pin.

Hoot

It's not exactly a cotter pin, but you probably could macguiver one in a pinch.

Some of the ones on the market suck and don't fit well. The one in my AA bolt fits poorly. It never wants to go back in. The pin on my Colt AR slips in like it's greased with butter. I'm thinking about trying one of the Armalite pins for my AA Grendel.