870
My 870, purchased in 1980 w/ a 30" full choke fixed barrel (rem choke was not even on the horizon, though win choke was) has had a steadily shrinking barrel ever since. One hunt with the gargantuan 30" tube was enough, and I paid big bucks for a fixed 26" full barrel. I also bought a 26" IC barrel and it made for a nice combo for all the years I small game/bird hunted. If you are looking for a universal barrel length, you might shop around for some of the old fixed 26" tubes. The 2"off from a 28" seem more than 2" , if that makes sense.
I'm strictly and deer and turkey man now, and my 870 is short and stubby to ease carrying in the dark, over many miles, and to point easily on incoming toms. My turkey set up is a 20" Rem choked, rifle sighted, slug barrel. The IC and slug tubes disappeared long ago, and screwed in to old reliable is a Rem factory turkey super full, the tightest one Rem makes. The rifle sights allow you to slide the pattern around until it's centered where you need it.
I hope to put it to good use in about 10 days.