It's been a long time since I've done any of this type work but it seems the firing pin block is unaffected because it is short enough not to come into play until the last 1/2" of firing pin travel. I don't recall gas vents on the bottom of the bolt although I once drilled some just because I thought it a good idea. As I said, it's been a long, long time. I'm hoping to learn from this post and am more than glad to admit my memory deceives me from time to time.
My response to this thread has bothered me since I posted it. Relying on old memories is a dangerous practice and I apologise for taking that course. My uneasyness sent me back into Frank de Haas's excellent book on bolt action rifles where I am ashamed to say, I learned my response was full of crap. I still don't see the firing pin block becoming an issue because the both the firing pin and the block are relocated by the same amount but there could definatly be a problem with the gas vent. Easy to fix but still there. Again, my apology for posting incorrect information.
