the gun and story are likely B.S.
its a National Ord , thats been ground, and hand stamped, all the metal is freshly painted with spray paint.
no stripper clip guide and cavity behind the recoil lug give it away.
i could build one just like it, in a day. with some of my shop grade stamps. some cheap paint and a shot out 1942 SA barrel.
ticking time bomb with a line of BS to go with it.
the only thing with any kind of real value or use...is the N.S. bolt..