Russianshooter,
Your photos do show some similarity with the 870 DM.
There are other third party manufacturers that have come out with box fed version of the 870 but they come and go.
However, without Remington factory support, one could possibly be left high and dry in a few years with no parts availability.
Of course the king of the box fed shotguns is the Saiga but they never have been 100% reliable with a wide variety of shot shells.
It's difficult to tune any semiauto to be able to fire high power shells and also very low powered shells.
Some of my considerations:
Variable length stock - Winters can be very cold in Minnesota. Deer hunting season is in November. I've hunted in -20 deg F weather. With a heavy coat on and several layers under it, a regular shotgun stock can feel really long.
A rail for mounting a red dot - The old eyes don't do iron sights too well anymore.
Besides that, when we bring our guns to the club to shoot matches, sometimes people will bring the most outlandish thing that they can.
I still want to do a match with my black powder revolver and a bolt action rifle (in the PCC or pistol caliber carbine event).
![Image](http://roundhouseinc.org/images/870/870dm1.jpg)
So here is the 870 DM that I purchased
I did find that it works just fine. There were no failures to feed fire or eject any of the various rounds that I tried; slugs, buckshot or birdshot.
The action is not like a "ballbearing on glass" feeling like my old 870 but it will get there in time.
It is rather ordinary looking and its time to spice it up a bit.
I did have one guy ask me "why"? The simple answer is because I want to and because I can.
I've got other standard unaltered shotguns.
I'll post more of the build when i get a few moments free.
“Never give in, never give in, never; never; never; never – in nothing, great or small, large or petty – never give in except to convictions of honor and good sense” — Winston Churchill, Oct 29, 1941