E Each completed production rifle was proof fired, then tested for functioning by firing three rounds.
Federal Ordnance M14 and M14A receivers were heat treated and carburized according to USGI drawing F7790189.Further, the Federal Ordnance stock had a slightly rough finish. The original owner of Federal Ordnance M14SA serial number 22XX reports that the synthetic stock never had a selector cutout or USGI markings inside the magazine well. Synthetic stocks on Federal Ordnance M14 rifles may not have been USGI models but of unknown commercial manufacture.Federal Ordnance M14 Serial Number Dates.
It might have a shorter life than say a better quality LRB receiver but at the price you paid who's going to complain?
The machining (or lack there of) around the oprod track in the receiver shows some of the issues these rifles had with their cast receivers, but overall if it runs and you are happy it probably doesn't matter much.
