This is factory percussion muzzleloading barrel for a Thompson Center T/C Renegade .50 caliber rifle. The barrel is 1" across the flats. It's 26" long and it will also fit .54 T/C Hawken rifles. The exterior is nice but the bore looks a little rough but it may clean up. The twist rate is 1:48" for shooting conicals & saboted bullets but it shoots .490 roundballs well. Please see our other items. We ship to the lower 48 states only. Shipping is 12.95. I will try to answer questions. This is for a muzzleloader and complies with all ebay rules.