The photos Jim posted for me are all from original trench guns. That it how the bayonet adaptors fit on the different guns. On the WWI 1897 trench guns the bayonet adaptor stud is flush with the muzzle of the gun. On the WWII 97 trench guns the mounting stud extends beyond the muzzle. Not sure why this is. Perhaps it has something to do with the fact that the WWI guns were solid frame and the WWII guns were takedown models. On the Model 12 trench guns the end of the bayonet adaptor that slips over the barrel is flush with the muzzle with the bayonet mounting stud protrruding beyond the muzzle. See attached photo. Notice how the muzzle of the barrel is in the white.