I believe as long as the bolt head comes from the same length action, you should be good with just the bolt head... As far as action related stuff is concerned. But you will have to either adjust the feed lips on the mag, or get one for a .223 since the case diameters are different.
I could be wrong on the bolt stuff, definitely double check... I believe bolt heads from an Axis are the same dimensions as a standard short action bolt head from a 110.
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