Stiller's-
Spin the Bbl off of your action & look at the circumference of the integral lug battery cam surface-a radius for the bolt lug aft surface to ride on.
Impossible to Time a radius to the primary extraction cam surface(35deg angle) of the rear receiver ring.
Inspect the bolt lug aft circumference as an attempt to make the bolt/action function/time properly-Impossible.
Defiance-
G.H. has never designed,going back to N.B.Precision abortions,but copies others w/o permission on a daily basis.
IF a Stiller or Defiance action is $12-1500,a Borden is worth 2X the aforementioned price by design & function.PERIOD.