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AR15.COM
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9/26/2009 3:56:53 AM EDT
Will the SR-556 take a standard muzzle device, or are you stuck with the one Ruger puts on there (either because it's pinned or because the threads are different?

Thanks,

John
9/26/2009 3:58:18 AM EDT
[#1]
standard 1/2x28
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