Is this the right barrel?
 

For shooting .54 caliber round balls?
http://www.gmriflebarrel.com/product...aspx?id=323903

nothing showed up on the link but an empty checkout cartDon't go ordering my barrel :) the 1inch, i need for the renegade says low in stock and is the 1:70 twist in .54 - thinking about ordering one as well and a .54 roundball sure would devestate some critters

Actually Pluckit I think this is what you need:
1".54 caliber percussion replacement barrel


Limited Quantity - 1" - Interchangable Barrel System - Specific round ball twist barrels for Thompson Renegade rifles. Blue finish with adjustable sights and complete with ramrod - .54 CALIBER IBS, PERCUSSION, 1:70" TWIST, BLUED, 32"...
Price: $223.95
The one you were looking at is not a replacement barrel.

Here's the page with the replacement barrels.

http://www.gmriflebarrel.com/catalog...adestylerifles

Better price here. But you have to call to see if they have them in stock.

http://www.longrifles-pr.com/gminterbarrels.shtml

Maybe this is not for a T/C or Lyman rifle. But the one you did bring up will not drop into the Hawkins or Renegade, but that would make a fine barrel if you're building a rifle.

It sure would. But it's no substitute for their Replacement Barrels. It's a plain unfinished barrel threaded for a breech plug - no other furniture. You're going to be spending a lot more by the time you add a bolster breech plug, wedge tenions, sights, bluing or browning, and a ram rod (all of which come on the replacement barrel).