They say this is an advantage due to machining tolerances and if everything isn't perfectly square the bolt head can flex enough to contact both lugs, which makes sense. The thing I wonder about if it isn't machined right and the head has to twist a few thousandths to get perfect contact, wouldn't the area that contacts the cartridge not have square contact? It would be better to have everything perfectly square but if this isn't possible, would it be better than having a solid bolt that isn't making perfect contact with the lugs but is still square against the cartridge?