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dented cases

  1. R

    Dented Case Mouth. What is the cause?

    The rifle is an Armalite AR-10 chambered for 260 Rem. I run the rifle with a TBAC silencer (hence the dirty brass). The gas block, handguard and barrel nut had recently been removed for some maintenance work. The 'smith may or may not have gotten the gas block to align correctly with the gas...