In 1953 Cummings set up Interarmco in Alexandria, Virginia, with a warehouse in Manchester, England, and other international locations to capitalize on the vast stores of postwar arms and ammunition.
[6] In the 1950s and 1960s, Interarmco flooded the American market with military firearms, catering to souvenir-hungry GIs and sportsmen, and drastically undercutting domestic sporting-arms manufacturers.
Interarmco was an original exclusive agent for ArmaLite,[7] and Cummings personally demonstrated its revolutionary AR-10 selective-fire rifle to various nations, including Nicaragua and the Dominican Republic.
Betrayed by local residents, the seaborne rebel forces (led by Cuban officers), were surprised at the water's edge; those dropping via parachute were hunted down in the following days by the Dominican army.
[7] During this time period, he became a British subject and moved to Monte Carlo, Monaco, while maintaining warehouses worldwide and the company Headquarters in Alexandria, Virginia.
Cummings also appears in Anthony Sampson's 1991 two-part BBC2 documentary about the arms trade, The Two Edged Sword, interviewed at Interarm's Manchester warehouse.