When threading the barrel we would have to remove the front sight. We machine the sight off to create a threading surface. I assume you would want a 1/2x28 thread which is not a problem. If the upper is fully stripped and just sent to us as a upper ready to go in the lathe you are looking at $200. If we have to fully strip the gun its an extra $100 so it would be $300 in total.
When threading the barrel we would have to remove the front sight. We machine the sight off to create a threading surface. I assume you would want a 1/2x28 thread which is not a problem. If the upper is fully stripped and just sent to us as a upper ready to go in the lathe you are looking at $200. If we have to fully strip the gun its an extra $100 so it would be $300 in total.