Oh, is that what' s on that site? No, the Vanguard DOES NOT have a mark five action. The Mark V bolt has 5 locking lugs (hence the Mark V designation). The Vanguard/Howa has 2 if I remember correctly, maybe 3 (it' s been awhile since I took one apart) but definately doesn' t have 5.

The only difference between the Howa and the Weatherby Vanguard is the rear bolt shroud. Period. How do I know this? Because I took one of each apart and had them side by side.