Just wanted to give you all a heads up that Volquartsen Closeouts on Ebay has complete Mark lV bolts for sale at $35 each and $28 if you buy 4 or more with free shipping. These have tapered ears like the old two piece bolts and will work on your Mark ll without any alterations. They are as I said, complete with recoil spring, extractor and firing pins with all springs included. Just the parts would set you back around $50 without the bolt. I like the tapered ears "cause they don't bite.