Thompson Center Interchangeable Dimension Loc 22-250 Remington Barrel, BluedCaliber - 22-250Length - 22Finish - BluedInterchangeable Dimension LOC Barrels. Barrels fit all stocks and receivers, right-or-left hand. Barrels come packaged with the correct magazine group (magazine and housing). Barrels are stamped with Series letters: A, B, C or D to help you easily identify the correct magazine group (magazine and housing) and bolt required. Interchangeable Dimension LOC Barrels