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, and 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.