Most of them need a round that's at least 1300 fps, people try lower rated ones with varying results.
Black Aces sells a 12 ga slug rated @ 1600 fps.
I work a range down here and see a lot of them.
Since you asked about "Reliable"
IMO . Unless you have a round that's 1300 fps and lots of them. Don't bother with the AR style guns.
OR read up on them, see what "aftermarket upgrades & tweaks" are available. Before buying one. NOT saying they're all like that, just see lots not function 100%
For the money, i'd buy a 1301 beretta, or the new mossberg 940. Or a benelli![]()
Sure the AR shotguns look cool. Would i go with one, over the usual style semi-autos? no.