Good morning, First time on this forum, so hello to all... I just picked up a nice condition Stevens 620 12 guage shotgun. I have a nice collection of military firearms and would like to turn this into a trench gun. My questions are: Did the 620 use the same heatshield/bayonet attachment as the Winchester 97? And if so how would it be attached to the barrel? And would the reproduction form Numrich fill the bill? And from the research I have done the barrel length looks like it should be 20 inches, is that correct? Thank you in advance.