The gun in the last pic's weighs almost 16lbs and has 36" barrels and the W&C Scott weighs 14lbs and has 34" barrels. I may have to check into that insert thing. I am pretty sure you cant use them in the US for dove or duck. Not even with chamber inserts. Its federal and they go buy the shell not the actual bore diameter. But I can use them for squirrels and turkey in Ga.