The Wheeler Delta Series Black Polymer Vise Block is a must-have for AR15 enthusiasts and gunsmiths alike. Crafted from high-pressure solvent-resistant polymer this versatile tool is designed to securely grip your AR15 upper receiver without causing damage. It accommodates both Mil Spec A2 and flattop style receivers making it perfect for a variety of maintenance tasks such as barrel torquing and barrel nut removal. The included receiver insert features a gas tube alignment system ensuring precision and ease during installation. Its universal mount type and durable design make it an essential addition to any firearm maintenance kit.