Our model CT is the same size action as the model M but has a larger barrel tenon to allow for the CheyTac case. This action is 8.500” long and is offered as a 1.550 diameter, and a 1.470 octagon with an integral picatinny rail at 20 moa. Weight is 48 oz. Load port length is 3.35 inches and barrel tenon is 1.187 x 16 tpi. This action requires a 1.35 inch diameter barrel.