Federal Ordnance M14 and M14A receivers were heat-treated and carburized according to USGI M14 requirements. Each completed production rifle was proof fired, then tested for functioning by firing three rounds. USGI parts and bolts were used extensively in Federal Ordnance rifles through at least serial number 88XX. In 1989, Federal Ordnance renamed the rifle the "M14SA" and "M14CSA". Rifles in the 93XX serial range and higher have modified receivers designed to accept Chinese-made bolts, barrels, and other parts owing to a shortage of original USGI components. Approximately 51,000 complete Federal Ordnance M14 rifles and 60,000 or more receivers were manufactured before production was halted in late 1991.