I may be late to the pony show. Came across this. Brief video on this page as well.
https://www.classicfirearms.com/bri...rel-12-m-lok-rail-tungsten-cerakote-m561163n/
Brigade Manufacturing Makasi 5.56x45mm FAL-AR15 Hybrid Semi-Automatic Rifle, 16" Barrel, 12"
https://www.classicfirearms.com/bri...rel-12-m-lok-rail-tungsten-cerakote-m561163n/