Thompson Center Arms 8320R 50 Caliber Encore Prohunter Rifle Barrel - 28in - Stainless - The ENCORE line offers a broad range of rifle, shotgun, and muzzleloader calibers. ENCORE barrels give you the flexibility to pursue nearly any game animal across North America and beyond. Muzzleloader and shotgun configurations expand your options even further. With ENCORE, you're not limited to one season or one caliber. Swap barrels, change calibers, and customize your firearm to fit your hunt, backed by Thompson/Center's reputation as America's Master Gunmaker.