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Ruger 57 5.7X28mm 5.5″ Threaded Barrel
Ruger 57 Threaded Barrel5.4″1/2 x 28 RHThis Kit Contains a Factory Manufactured Stainless Steel Barrel For Optimal Fit and FunctionFeatures:Fits Ruger-57Threaded 1/2-28Includes thread protector, adapter, and wrench