These three sets of sketches are from an early stage in the concept, used to flesh out some details and forms. The bottom left was a comparison between over and under shoulder formats, I ended up deciding on overshoulder as the underslung format was too simplistic and had too many removed elements, even if it was more realistic.
Top Right was an ergonomic assessment of the design I had produced, in order to further refine the design and shapes used in the concept.
Bottom right is the evolution of an idea for a rotating foregrip, progressing from an initial design that looked too utilitarian and barebones WWII-esque. This progressed from the same design using sharp angles and triangles, to trimmed down versions, and a design that was a 90ᵒ hoop.