Well, I do not know. ..................
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O,K. I wont be so bad. Most shops charge 65-85 to thread a barrel. I know some that charge 25. 35-.......35- to turn the gas block
area if you take the upper apart and supply the barrel only. I it is probably about in line. /So, 85+35=120.
Depending on what all else they do, they may have a machine set up ready to go. In most cases if you run a shop at 65-85
per hour and you have to set up to turn, thread a barrel, then turn the gas block area, yes, you can spend a couple of hours
doing this. If you have a dedicated machine with tools handy and no one else need the machine, You could do it in 45 min
to an hour. Also, you will have to receive it in, note it, make a work order, do it, do the paper work/accounting, box it back up, log on to UPS make a shipment, print the lable, tape it on, carry the box out to shipping. Ya, I think 125 is fair price.