BINGO!!! Found me an M1 yesterday! I was helping a dealer friend work his table at a local gun show and a gentleman walked up with one on his shoulder. I asked him if it was for sale and the rest is history! In addition, he had the original box with him in his car! It's not an HK gun but the gun is in MINT condition, so I couldn't be more pleased. It has the 18.5" barrel with rifle sights and multiple chokes. It also has the magazine tube that is as long as the barrel. I'm not sure yet but it looks to be the "defense" model with the pistol grip.
Gentleman, I promise to post pictures later today. I am probably going to have some questions for you all. Lastly, I know that I am probably going to sell or trade the barrel so that I can get one with the ghost ring sights.
Thanks