I don't have a factory riot gun but I have a 870 & 1100 slug guns
Also a Brn A5 cut down into slug gun and a 97 Win I cut to a little
less than 24" ( barrel was Bubbaed) and had it threaded for screw in chokes. Last, a 18 1/2" barrel H&R Hammerless SS 12g
beater. I don't need no stinking riot gun!