Photo Of The Day and we go to India to take a closer look at some marketing images of SSS Defence’s M72. Chambered in 5.56×45mm NATO and built around a short-stroke piston architecture, the design distills lessons learned by others and mimics similar systems already in use. In case you don’t remember, SSS Defence is competing in the UK Ministry of Defence’s Project Grayburn program, which we’re watching with interest.