You can't just drop a picture like that on us and leave us hanging.
Details, man. Details!
Found this High Standard Model 10B shotgun in Tuscon around 84-85, it was from an estate sale. I'd always wanted one so I asked the price and it seemed reasonable. One of the things I noticed is that it was either almost unfired or someone had done an amazing job of cleaning as there wasn't even a trace of brass scraping on the loading gate.
It stayed unmolested until 6yrs ago when I decided to have an extended magazine tube installed. Choate was the original makers of the magazine tubes, but of course they didn't have any left over from the mid-70's. They were able to connect me with someone who had some experience with the project and gave me a few ideas. I finally located a gunsmith in Florida who offered a magazine tube constructed from two original tubes. It now has a full 7-round capacity, even with Federal LE123-00 Buck.
The Eotech came last year, when I got tired of having to sight-in after each time I had a thorough cleaning (the 10B requires the front sight be removed for complete take-down). The old carry handle/sight combination comes off with two screws and it was an easy mod to put a M-1913 rail on top.
What's it like to shoot? Surprisingly, the recoil is less than what I feel with other shotguns. The straight line of the recoil helps with that a great deal, I suspect. Dumping a full magazine is a piece of cake with great controllability.
It was really an idea ahead of its time. I wonder often how well a bullpupped shotgun would be received today.