To bring this topic back, I just ordered two of these kits from Centerfire. The firing pin appears to be part of the bolt, but actually isn't. There is a small cross pin to punch out, then you need a long thin punch to get into the bolt and push out the firing pin. There appears to be enough space in the bolt that a floating firing pin could be installed with no milling. I would like to see these built up, should be nice guns.