Stoner conceived the Stoner 63 as a modular weapon system that could be configured for various roles, providing a flexible and adaptable solution for military forces.

The Stoner 63 underwent testing and evaluation by the U.S. military, including the Navy SEALs. While it showed promise, it wasn't widely adopted due to logistical complexities.

The Stoner 63's key feature was its modularity. It could be configured as a rifle, carbine, light machine gun (belt-fed or magazine-fed), or even a mounted weapon system. This adaptability made it unique for its time.

Although not widely adopted, the Stoner 63 influenced later weapon designs and demonstrated the potential of modular weapon systems. Its innovative approach left a lasting impact on firearms development.