The Obsidian Arms upper receiver vice block is machined from High-density polyethylene (HDPE) to hold your upper receiver in a bench vise without fear of crushing, marking or scratching the finish. Simply secure the assembly into your vice, slide the upper onto the block, and insert the provided locking pins.
- Fits all standard AR-15 upper receivers
- High-density polyethylene (HDPE)
- Locking pins included