Does anyone know where to get a die to thread a 9mm barrel for a flash hider. It is the 1/2 by 36 thread. Brownels advertises the 1/2 by 28, but that will not work as my suppressor is 9 mm.
Thanks

Good advice, except it is already threaded, I just want to clean it up a bit.
Thanks

Check your local machine shop, they may run a die over it for you. Probably just a $5 type cash deal.

Quoted: A GOOD machinist can "pick up" on those threads and single point chase them. You might also look for a thread file that will follow the existing theads.

Good advice.  You can use a simple 60 triangular needle file to clean up threads a bit.  It's easy if you have a way of rotating the bbl slowly and evenly.  Of course a lathe is the best, but I'm sure there are other means.  Once the bbl is rotating, apply the file at the correct angle (gently) and allow the bbl's rotation to carry the file along the entire thread run.  

A triangular needle file is already set up with a 60 degree angle.  it needs to be held evenly and with a bit of cant or lead.  It's not going to remove a lot of metal, so don't be afraid to try it a bit.  I've used this technique after chasing threads in the lathe, and I just want to deburr or remove that last 0.0002" because the thread is just a little bit tight.

Follow any threading op with a wire brushing.  This will also ease the fits a bit.  When a barrel or any thread job leaves my lathe, it is usually in a state of "Yeah it'll screw on, but it's distinctly firm".  Wire brush, + needle file, + a few on and off with oil of the female thread item will take it to a nice state.

Good luck!  

Look at  J&L,  and   ISC