Griffin Armament Low-Pro rails are a slim low profile ultralight yet rigid M-LOK rail. Design objectives of this rail were to provide a slim ultralight rail with increased rigidity over similar weight and profile current market options. A custom extrusion provides significant internal reinforcement to reduce flex when gripping the carbine firmly in the shoulder pocket. Understanding the importance of low light targeting these reinforcements provide rigid mounting for IR laser aimers ensuring minimal POI shift when torque is applied to fore-grip type accessories or when loads are applied to the rail (shooting off barricades loaded bipods etc). Internal testing showed 70% less POI shift with laser aimers versus competing “slim rails”. Carefully positioned slots in the rail allow for rapid cooling when running the carbine fast while maintaining rigidity.