The threads are 1/2-28. Shouldn't be too hard to find a 1/2-28 bolt to check the threads on the Vortex.
No doubt you paid between $50 and $90 for it, so if that bolt doesn't screw in easily, I'd return it.
If you are going to chase the threads in the vortex, you'll need to use a bottoming tap. For the barrel, a standard die will work.
As, I said if it doesn't screw on, I'd return it. Speaking from experience, LOL.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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