Bar-Sto .355 Gov’t MT 5” Bull Barrel – Clark/ParaDescription Bar Sto . 355 Government Length Match Target Bull Barrels Clark Para Bar Sto Precision Machine has been making some of the finest auto pistol barrels available since 1971. Bar Sto barrels have been used by the U. S. Marine Corps Marksman Unit since 1977 as well as the U. S. Army Marksman Unit. They have also been used to win every major pistol tournament worldwide, including Camp Perry, the USPSA Nationals, Steel Challenge, the Masters,