Yes they are substantially better than those actions, with their integral recoil lug & rail, plenty of primary extraction, extremely smooth bolt, & general "solidness".
Also available with a .750 bolt for Lapua magnum bolt face in a standard Rem footprint & size.
The Defiance actions are essentially the Rolls Royce of actions
A bit of Googling should help you a little.
With the current exchange rate & all associated costs they are approx $3400 inc gst for a short action.
If I have a current permit & they are in stock I can generally get them in under 3 weeks if customs play the game.
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