navyshooter posted very nice photo of his Remington 870 with Magpul stock and forend and Mesa Tactical sidesaddle on Remington 870 Forum:

Remington 870 with Magpul Stock/forend and Mesa Tactical Sidesaddle

Remington 870 with Magpul Stock/forend and Mesa Tactical Sidesaddle

Recommended Product:

Remington 870 SGA Stock Set

Remington 870 SGA Stock Set

You can get Remington 870 SGA Stock Set on Brownells