This stud is the same stud I use when installing bolt knobs on Remington 700's. Its turned in house on a CNC turning center, the turned end features 10-32 threads and the other is 5/16-24 to fit the vast majority of the knobs available today.
This is for the DIYer, you will have to be capable of machining off the factory knob and drilling and tapping the handle to accept 10-32 threads.
***Please note the bolts pictured below are for reference only, they are not included.***