The M41 Spanner Wrench is designed to provide quick and easy installation and removal of the M41 Severe-Duty Muzzle Brake. Close fitting design provides the best method of installation to avoid damage or marring. Square 3/8″ drive socket allows attachment of a torque wrench for precise tightening.
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Break was installed by my gun shop. He said he was handy to have. Left no scratches on the break.