I have a factory Remington 700 Stainless 24” sporter contour take-off
barrel in .300 win mag. It is .615 diameter at the muzzle. This barrel
was removed from a rifle (bought new, back around 2003 ?) as Kenny Jarrett
built-up a custom on the action. I don’t have a bore scope, but believe
it was never fired, has been stored in a gun safe ever since.

Barrel says: Remington Arms Company Inc. ILion, N.Y. U.S.A. 300 WIN. MAG ”
$ 120 shipped (in lower 48)

Also have the Factory stainless trigger group from it.
$ 40 shipped ... $30 if it goes with the barrel.
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Silver_Bullet