I just inherited my grandfathers Ithica side by side 20 gauge serial # 251400. He was a terrific shot once beating a pro shooter in a best out of 100. He shot 99 and the pro shot 98 out of 100. Grandad never took his 100th shot. Anyway, the shotgun has seen so much use that it is unsafe to shoot now. It has a small bulge in one barrel and the overall barrel thickness seems very thin to me. I am curious as to when it was made. Also, what are the chances of coming across a replacement barrel/barrels? Any info that anyone can give me would be much appreciated. Thanks in advance. RB