Looks like a Zorg ZF-1 prototype

Link to boost discussion

The PAPOP (PolyArme POlyProjectiles, “multi-projectile multi-weapon”) was a French project to construct a computerized infantry weapon for the FÉLIN system, capable of hitting hidden or protected targets. It would have combined a 35 mm grenade launcher with a 5.56×45mm NATO assault rifle, both in a bullpup configuration, complete with targeting aids and an unorthodox sight.