In the UK the minimum barrel length for a shotgun is 24 inches, however in open division IPSC rules allow any length of gun so magazine tubes are usually up to 14 + 1 and in modified division an overall length of 1320 mm also allows a mag tube that can take 14 + 1 65 mm cartridges. So comes the choice of choke and barrel length, I can't usually be bothered to change the choke so usually use modified about (1/2) or sometimes use improved modified (3/4), but find the modified choke is better for buck shot. I usually shoot a 30 inch barrel but have also used 28 inch either way it’s significantly shorter than the mag tube. I don’t bother with a compensator as I can’t see they are that effective and only ensure that smoke is directed in your field of vision.
I prefer an 11-87 with wooden furniture and yes it is heavy on a 28 plate 100 yard dash through the woods but long barrels mean that you don’t need to run and can pick three or four shooting positions to take the plates, I always take the long shot rather than all that running and stuff (I cant run faster than 1400 fps so don't see the point in it).
As for reliability the bits that break are well known so change them every few thousand rounds and it won’t let you down in a match.
When asked for advice before a stage, I usually give the usual answer "shoot fast don't miss", but then clarify this as there is a very important lesson, for a 28 plate field stage, you don't want to waste time loading extra round. so you should only load 28 that extra round just in case has probably wasted between 1 and 2 seconds (this is for just in case Mr Sullivan), it may only be a couple of seconds wasted but if you shoot cleanly you wont need it and you will be more likely to take the stage.
Oh and in the UK no rifled barrels or rifled chokes, so all slug is shot through a smooth bore, I prefer full or 3/4 choke.
In many cases there is a lack of understanding of how the gun works and the gun / ammo capabilities, it is quite common to deliberately take two plates with one shot, is because the gun and ammo are capable of it in rare circumstances the observant shooter may even be able to take three plates (top wood shield 2001).
Remmington only need to make a few bits stronger and there fine.