Singleshot,  I have a 32" Green Mountain drop in .40 caliber barrel for my TC Pennsylvania Hunter rifle.  The barrel dropped right in without any alterations needed.  Accuracy is very good. The only complaint I have, if you can call it a complaint, the barrel is very heavy.  

  I think that barrel will fit most of the precussion TC rifles with a 15/16" barrel.  
Here's a photo of my wife shooting the .40 from the bench.  There's hardly any recoil.  
