Thompson/ Center’s new Dimension line is a bolt action platform that you build on, season after season. No gunsmith required. Start by purchasing one complete Dimension rifle in your favorite caliber, then choose a second barrel in the next caliber you want, as well as the bolt that matches the sam letter series as the barrel: A, B, C, or D. If both barrels are in te same family, you can use the same bolt. Example: If you already own a Dimension in .30-06 Springfield and you want to make it a .233 Remington, use your current stock and receiver, then choose a .223 barrel. It comes packaged with the right magazine group (magazine and housing.) Your new .233 barrel falls under Series A in the table so choose a right or left hand Series A bolt. If your new barrel/ caliber is in the same series: A, B, C, or D, you dont even need a new bolt. These interchangeable bolt action platforms will have a manufactures suggested retail price in the mid $600 range and should be in stores Spring 2012