Someone on another site said that after the initial conversions of gas traps at the Armory, the gas traps that were already at the units, the units did the conversions of gas traps that they had, leaving the original parts and just changing the barrels, gas cylinders and front sights making the change with barrels and gas cylinders they had at the time. IDK how true it is, but it seems like a logical solution to rifles that were scattered all over the country. The units would have had replacement parts to repair weapons at their facilities. I'm not trying to be difficult, I'm just trying to understand why an 8-41 barrel and gas cylinder make it a definite restoration, and it very well could be a restoration.