The barrel nut wrench works to tighten both the 556/308 Switch™ barrel nuts as well as the Night Rail™. The Night Rail™ comes with a tool, but the Switch™ rails do not. You can use the standard 3 prong DPMS tool for the 308 and a standard AR15 spanner wrench for the 556 Switch™ rail. Please follow proper Switch™ installation procedures.
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