The Birchwood Casey AR-15 Upper Receiver Vise Block is the perfect tool for hassle-free cleaning assembly and maintenance of your AR-15 or equivalent rifles. Engineered with a soft jaw design it safely clamps into any vise without scratching or marking the receiver. This vise block securely installs onto the upper receiver with included snap pins ensuring a firm grip during use. It's ideal for precise barrel installation and torque adjustments. Designed for durability and simplicity this gray vise block is a must-have for any firearm enthusiast or gunsmith.