The standard 5.56x45mm NATO and 9mm Parabellum are being challenged by "intermediate" cartridges designed for better performance through barriers and at longer ranges.
In the 20th century, optics were a luxury; in the 21st, they are mandatory. The "iron sight" has been relegated to a backup role. Tactical Small Arms Of The 21st Century: A Comp...
The defining characteristic of modern small arms is modularity. Today’s operators require weapons that can be reconfigured in the field for different mission profiles. The standard 5
M-LOK and Picatinny rails allow for the seamless attachment of lights, lasers, and grips. optics were a luxury