TC4744 in factory clampack. This TC Encore Weathershield 26" Fluted 209x50 Muzzleloader Barrel is brand new and unfired. Weathershield is a new product for Thompson Center Arms, and they say it is 50 times more corrosion resistant than stainless steel. This is a new production run, 26" fluted barrel, Speed Breech plug removes without tool ( fingers only), it removes with about 8 full threads, and is drilled and tapped for a scope rail included, and has a heavy duty ramrod too. It is not drilled and tapped for sights. Check out the pictures. Thanks for bidding.