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I think Jack is correct about the Mercury filled tube you want. They run about 50.00 in Brownells and work somewhat. They also add about 20oz to the rifle. i put one on a friends 300 UM and he said it still kicked him so we installed one of my brakes and now it`s a pussycat. A little louder but sure more comfortable than before. His groups tightened a lot too with the lack of recoil.
Aloha, Mark
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