For all calibers. Design was thoroughly researched for effectiveness. Detents at rear designed to work with spring-loaded plunger at the front of the front sight. Threaded for 24x1.5mm right-hand threads. The finish on these didn't turn out as we anticipated, so we're selling them "as is". A real bargain if you're planning on refinishing your rifle, or to re-finisih to match your current rifle.
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