A precision machined ring that slips over the existing muzzle threads on the FN SCAR 17S rifle. It precisely bears against the thin factory barrel step to create a large “true shoulder” which allows any (at least any we know of) muzzle device to be installed and aligned properly. Turned from heat-treated 17-4PH stainless steel and finished with a Melonite coat.
Leaves 0.60″ of threads exposed
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