deerless- yea i am sure they are using a CNC machine to cut the threads as well. i am only looking to match the size and thread pattern and chase the threads not to actually thread a barrel. a file was my first thought but due to the threads being down in the barrel about 3/4" i cannot get to the top starter thread well enoungh to straighten it out with a file which is why i decided i should try and chase the threads with a tap.
FrontierGander- thank you i was thinking that as well i have not tried to match this up yet cause i have been out of town on a job not at my shop but i will either tonight or tomorrow night when i return home.
thanks for the information guys!