I've owned this gun for quite a long time. I've used light 2-1/2" RST ammo in it in deference to its age. I have decided to sell it and when taking photos, noticed that the barrel flats are marked 3". The chamber gauge confirmed it. The gun weighs 7 lb 2 oz. Is this a rare configuration especially in this light weight? I've only owned a few Parkers, mostly lower grade and smaller gauge.