That's a damn good benchmark for a dream fighting gun.My "dream" fighting shotgun setup ? A Remington 870 Wingmaster, 20" field barrel w/ brass bead, w/ mag tube extension and fixed cylinder bore.
But I'll settle for a 20" hammerless coach.
I had the same experience with a Remington 1100M as well..I've posed this admonition before but I think it bears repeating: When installing a "side saddle" type shell carrier to the receiver of a Benelli Nova pump shotgun, be careful not to tighten the bolts down too hard. Doing so will distort the plastic receiver enough to prevent the pump from moving; at least it did on my Nova.
Pics for reference, this is my idea of a pair of perfect fighting shotguns. I have a couple other remington/mossbergs but these are my idea of the ideal fighting guns.
Remington 870 :top
Mossberg 590 :BottomView attachment 1100630
Your criteria is incompatible with me. A light to PID, a sling for retention because a sling to a long arm is like a holster for a handgun, and a simple yet light and rugged red dot for faster target acquisition that depending on the model, removes any parallax doubt like sight alignment would with irons. And an adjustable buttstock because LOP really does matter, makes for a mission capable home defense shotgun in my hands, or it will be almost worthless due to quixotic handicaps being decreed.Shotguns need to be basic, no frills, simple affairs in pump or semi-auto. Too many accessories means too many distractions.
Only thing I'd change is rounds in the saddle facing brass up, I had them down for a while and sometimes under recoil I'd lose a round or two, the elastic dies a lil over time and while I got to liking stripping rounds out of the saddle brass down, I can adapt back to pulling them out brass up.Slick and clean. I really like those guns.
And an adjustable buttstock because LOP really does matter
I would respectfully disagree I can't speak to the difference in mounting speed re short vs longer LOP stocks, but I noodled around with my thumb and head position on a stock that was too short and under recoil, I was getting bonked (nose, not lip) and it put my head too far up toward the receiver. Putting a few spacers in made all the difference for me. I'm also a quite a few inches taller than the average guy and have long arms so others of more average height might be able to rock the shorter stock better than me......If your thumb is thumping you in the lip, move your thumb.
And if armor is being worn (should be worn regardless if there is still time situation dependent), they can also get all of the armor facing the threat instead of showing an unarmored cummerbund or if soft armor is being worn an unprotected shoulder and armpit.Combat shotgunning has ones body facing the target more. Gun tucked a little more on body for recoil control. Hence the need for less LOP