Austrailian Special Forces use something similar.
It's standard issue, and has a built it low power optic.

Looks pretty sweet, but it would take some disciplined practice to keep that front hand back behind the muzzle.

If you like this design, you may like the P90 in 5.7mm.
Very small, and with the right ammo, can penetrate body armor at 200 yards. It's in use in the US. Do a search.