That is kind of amazing, actually. I had my Remington 11-87 set up with a 26" threaded barrel, which is the shortest length that will fully use the auto-adjustment for different levels of power of the shells. From really light loads to really heavy loads will cycle the action. I added a screw-in Poly-Choke instead of using the regular screw-in chokes, so I could dial in the amount of choke I wanted for the type of shell and the application for which I was using the shotgun. Defense or hunting.
My gunsmith at the time installed a 5-round additional capacity magazine extension to give me 9+1 in the gun. I used a pistol grip Speed-feed stock that held 4-rounds. I kept specialty rounds there. I covered the Speed-feed slots with a 6-round butt-cuff. I also added an 8-round sidesaddle giving me a total (with one in the chamber) of 28-rounds in/on the gun.
Additional modifications included a larger bolt handle, Easy-loader carrier release, ghost ring sights, over-size safety, high-visibility magazine follower, a magazine clamp with a Picatinny tri-rail (for use with a light/laser unit and a rail mount bipod, and several sling attachment points and a snap hook sling.
The gunsmith machined a 'button' that he attached to the end of the magazine tube, and with a bayonet adapter mounted the correct distance behind it, I could attach my OKC3S bayonet.
It was long, and heavy, when everything was mounted. However, with throw-lever attachments on the light/laser and bipod, it lightened it up some when I removed them. If I did not have a full load of ammunition on it, that made it even lighter, primarily for hunting, where I would not need as many rounds available.
It was primarily for under-100-meter site defense, not patrolling, where the weight was much less a factor.
I had an adapter on my PTR-91 that would also take the OKC3S bayonet, so I was covered either way.
Unfortunately, when I became more seriously ill, I had to sell both of them to help defray medical costs.