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I used this jam nut to install a Yankee Hill muzzle brake on my T/C Compass which did not have a sufficient shoulder for timing with shims. I was afraid that I would not be able to use the YHM Resonator R2 silencer/suppressor with my T/C Compass .308 because the Quick Disconnect muzzle brake that came with it requires shims to time it correctly. I heard that I can also use a jam nut rather than the shims, so I purchased this one from Optics planet and it works perfectly. The only drawback is that it was so expensive.
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