An example would be these bench blocks which not only support a workpiece but also have cutouts specific to firearms to make life easier.
TFB Armorer's Bench: Closer Look - Wheeler Bench BlocksThe Firearm
The Armourers Bench
Wheeler Delta Series AR-15 Armorer's Bench Block
TFB Armorer's Bench: Closer Look– Strike Industries Adjustable Gas
Wheeler Universal Bench Block with Non-Marring
Bench Blocks Up To 37% Off on 22 Products
The Armourers Bench
At the Armorers Bench: The Not So Universal Bench Block - The Mag Life
At the Armorers Bench: The Not So Universal Bench Block - The Mag Life
Wheeler universal bench block box opening review
Patient Information – Health Max Hub
The Armourers Bench
Wheeler Universal Bench Block with Non-Marring