Thompson Center Encore 50 Cal Muzzleloader Barrel and Ramrod Blued. I have a used Thompson Center Encore 50 caliber muzzleloader barrel for sale. This barrel is used, and it’s in good shape. It shows a few signs of use, but looks very good overall. The bluing by where it meets the receiver is thin. See pictures for condition. This barrel measures about 26 inches long from end to end. It has an attached sights and comes with the ramrod. Bore has looks good, but does have some pitting in the first 8-10 inches. It’s not too terrible, but it’s there.