7.62MM Devices There were only 15 devices chambered for this cartridge. The barrel length was approximately 21”. Manufacturers were Remington and Walker. Some of the barrel descriptions were electro-penciled, especially in the case of the Walkers. Receivers were the usual combination of Remington and Smith Corona. Barrels appeared to be stainless steel as well as blued. The drawing number on these devices was D7553790. In some instances this number was stamped on the barrel while being electro-penciled in other cases. Some of the bolts were numbered to the receivers and others were not.