So that is the switch barrel in a nutshell. But what are the real facts of the matter when it comes to. GASP! Taking the barrel off your rifle and then putting it back on again? Why in the world would you want to be able to pull and reinstall your barrel anyway? The first answer is quite simple. The second reason for a switch barrel is caliber changes with multiple barrels. What about the all important question of shift in zero? So I unscrewed the barrel .

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