Hi all, I'm told this is where the experts hang out so here goes.
I recently acquired a pistol barrel that I can't seem to find any info on.
It is 6" long with the rear portion being a tapered octagon and the forward portion being typical Luger in shape. A .30 Luger round chambers nicely. The threaded portion is 18mm, (.708) O.D., and is .740 in length from the shoulder to the breach face but the thread pitch is 20 t.p.i. according to my thread gauges. It has a top extractor cut and typical Luger feed ramp.
There is what appears to be a small letter E stamped on the left top side of the male front sight dovetail. There is a serial # of 66686 stamped on the bottom of the octagon shaped portion. The rifling is left hand twist. There are no more markings that I can find. Any help on this matter would be of great help as I cannot find anything but all round barrels referenced.