Muzzle Hardware
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Ruger Mark 2/3/4 Bull to 1/2-28 RH Thread Adapter - Black (Steel)
$39.99Thread your unthreaded Ruger© Mark II, III, or IV bull barrels to 1/2"-28 RH with this premium grade thread adapter. Made out of black oxidized steel, simply slip this adapter over the end of your barrel, tighten the brass set screws, and that's...$39.99