I need the tools to properly torque the castle nut on the buffer tube and eventually the barrel nut. It looks like most armorer's wrenches only have the square hole for the torque wrench on the barrel nut end of the wrench. Does anyone know of an Armorer's wrench that will allow me to use a torque wrench on the castle nut end? I've seen a few nicer tools like the Spike's and Hammerhead but I'm hoping I can find the all-in-one style for $30 - $40. I already own torque wrenches. Thanks.