You can service your OMEN/308/AR-15 with our multi-caliber upper receiver vice block. It is a great tool to mount to your scope or clean your barrel and upper. This machined vice block will secure your upper receiver using pull pins or you can install pivot/takedown pins and they are installed just like your lower receiver. The vice block is machined from billet 6061 aluminum and anodized black. This vice block will fit the OMEN rifle, AR-308s and AR-15s. On one side it fits the OMEN and the other side it fits the AR-308 and the AR-15 A very functional, must-have tool.