Just purchased a 12 gauge with SN in the 325K range. It has a very fine line on the tang , in front of the small screw that lies ahead of the safety. It appears to be a jointing line between the frame and the portion of the tang where the safety is located. So is the tang a two piece affair or is this the result of some modification?? BTW, Case colors, 30 in barrels, very tight action; the gun is about 90% in the metal, wood a bit marked up. My first Elsie.