Metal Gear Solid 5: The Phantom Pain – Side Ops 05 Secure the [RIOT SMG] blueprint
Head to Wialo Village to find the blueprint for the Riot SMG.
Metal Gear Solid 5: The Phantom Pain – Secure the [RIOT SMG] blueprint
Make you way to Wialo Village and either get a soldier to spill the beans on the blueprint location or head to the location above to find them.