My favorite 870 stock - Remington 870 12 Gauge Shurshot Stock Set

This stock and forend set is well thought out and executed. The rubber overmolding gives a good grip surface. The Monte Carlo lift gives a nice and rapid sight picture. The pistol grip has just the right conture to fit my hand and allows easy reach to the trigger and safety. The recoil pad is just cushy enough and is a drop-in part (no grinding needed at replacement).
On first installing it, I found the balance of the gun was too barrel heavy for my taste, but I adjusted this by filling the hollow stock with a slurry of birdshot and silicone caulk and letting it cure for a week or so. This, of course, makes the gun a little heavier to tote around, but has the benefit of reducing perceived recoil quite a bit. Makes for a quick mounting and comfy shooter.