TFB Armorer's Bench: Closer Look - Wheeler Bench BlocksThe Firearm Blog

An example would be these bench blocks which not only support a workpiece but also have cutouts specific to firearms to make life easier.

Video – Page 5 – The Armourers Bench

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AR 15 Armorer's Bench Block

AR 15 Armorer's Bench Block

At the Armorers Bench: The Not So Universal Bench Block - The Mag Life

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At the Armorers Bench: The Not So Universal Bench Block - The Mag Life