I have my 11-87 and a WingMaster 870 set up with cantilever barrels and Bushnell Red/Green Dot scopes and every year during a test fire before the hunt they are bang on ! Remington's are great for after market add on's or modifications and finding a barrel should be easy. Hastings is another mfg. of barrels for Remington's. Sabot slugs aren't cheap but I am so for me 5 bucks to test the gun and 5 bucks to fill my Tag works for me. Nowadays most of my hunting is done from a wood platform built up in a tree so I usually have the luxury of time to set up my shot but when I was a dogger the 870 had a 21 inch IC barrel with Challenger Rifled Slugs, cheap, nasty and easy to use. Uncle Mikes makes Sling Kits for all kinds of guns and are easy to install. Your local gun shop should carry them or try Shooters Choice, Ellwood Epps, Triggers & Bows, etc..
