This is a good idea of a tool. I am certain the refacing seat on the tool is flat, but it the picture it does not look flat. Does anyone have one of these that can confirm - I would figure it'd need to be flat and true.
yes, there is a flat spot on the taper. As noted earlier, it does not address the dimple, but does smooth the burrs in the chamber that will cause feeding issues.
I bought a similar one from Brownell's years ago that had a metal handle that would just fit in a Chiappa .22lr upper that I had. Worked very well.
The issue arose from magazines that would not hold the bolt open and there would be a dry fire every time the magazine emptied.
I ended up buying some wall anchors that fit the chamber and would prevent the firing pin from hitting the face. I just loaded one of these in the magazine before any ammunition.
The ones I ordered in 2016 fit better than my order last year.