New Bear Creek Arsenal AR15 410 Shotgun and Upper

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New.
Not sure how it compares to others on the market, but you can get it as a complete gun, or just buy the upper, and use it with any standard AR15 lower.

3" chamber allows manual loading of one 3" shell. (3" won't fit in the magazine)

5 round magazine. (in vid he says other brand mags can be found in higher capacity)

Side charging.

https://www.bearcreekarsenal.com/calibers/410.html

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How 'bout that Arby's hamburger?
Mmmm... mmmmm...