For #FNFriday here are some Belgian SCARs being used. Just last Tuesday days ago Brussels, the capital of Belgium, was attacked by a suicide bomber. Luckily he sucked at his job. The Belgian Army was seen patrolling the area after the bomber had been neutralized. You can see they were primarily armed with FNH SCARL. Im not sure if these are considered MK16 like the ones the US uses. The MK16 has a shorter barrel.

From the photos, some of the soldiers are using Trijicon Acogs with RMRs mounted ontop. However there are a few, like the soldiers below wearing berets, are using what appears to be a far forward mounted red dot. Possibly an Aimpoint CompM4.