Hylander,
Only the "small ring" mauser actions are suitable for fitting with a Remington 700 take off barrel. The "large ring" Mausers actions require a larger barrel shank than the Rem 700 barrel uses.
This fitting requires a skilled machinist and lathe properly setup. The old threads are cut off, the breach end is shortened, the
barrel shank is brought to proper diameter, and the shank is rethreaded for the 12 threads per inch Mauser. Rechambering is sometimes required for proper headspacing.
The Rem 700 take off barrels may be CHEAP, but the work for properly fitting an action is NOT!