Remington Model 11 12Gauge military

I was talking to a friend the other day and he was describing Remington Model 11 he had seen. This was in the original wooden crate and in excellent to mint condition. It was a short barrel with a Cutts Compensator choke. The choke was a little longer than a spreader choke and shorter than a normal choke. The odd thing about this choke was that it had two protrusions in it that he called knife blade in appearance. The sharper edge facing the receiver and thicker side facing the muzzle. I have an idea that this was a special configuration the military ordered. He claimed it was to provide a wider spread for buck shot. Does anyone have knowledge of this type of choke being used, and if so what was its real purpose?

Pics would be priceless, but yes, there were spreaders of various descriptions used. I saw a 10 Ga double that had been done by a blacksmith for use at a mine site. The muzzle had been flattened and would spread the shot to a desired width at 25 yds... I don't understand "Original wooden crate" though...unless you mean the case several shotguns would be shipped in? Are there Military markings? Flaming bombs? There aren't many shotguns that don't have them that were military issue...

All I know is what he described the wooden container to be. Wish I could have seen it. The model 11 itself had the millitary markings on it but, what exactly they were I couldn't say. It would have been nice to have a camera at the time but, he wasnt looking specificaly for anything at the time. The tube itself is what has our curiosity up. Thanks for your help.

May be a duck bill choke. From what I have read it was used to produce a flat pattern. There are some pictures of one in the link below.


An Air Force Security shoulder arm. - SHOTGUN / TRENCHGUN [REF] - U.S. Militaria Forum