You are more than likely going to have to look for a TC custom shop or other custom build built barrel as I don't believe this is a standard chambering. I have a custom shop that's a 16.25" heavy and it is a real tack-driver! It's extremely accurate and is my go-to set-up for plinking, varmint, and just about anything other than deer hunting around here... but I'm not planning on getting rid of it anytime soon!