The Tiger Rock Inc. LO 223/5.56 Rifle Lower Receiver Vise Block delivers functionality and durability to your firearm maintenance routine. Crafted from lightweight, heavy-duty glass-filled polymer, this vise block fits securely into the magazine well, held in place by the magazine catch. Ideal for AR-15 enthusiasts, it simplifies installation and repair tasks, enhancing your workbench setup. Glass-filled polymer construction Matte black finish Designed to fit in magazine well Length: 4.875 inches Weight: 4.6 ounces Compatible with AR-15 Elevate your firearm maintenance with this indispensable vise block.