Here is Remington 870 Tactical from Remington 870 Forum:

Remington 870 Tactical with Magpul Furniture, Mesa Tactical Sidesaddle

Remington 870 Tactical with Magpul Furniture, Mesa Tactical Sidesaddle

Setup:
Magpul SGA stock and Magpul MOE forend
Elzetta flashlight mount
Mesa Tactical Sidesaddle
Magpul MS sling