Howard holding the original small disruptor.
The Makluan Energy Disruptor, A.K.A. the Quantum Dot Energy Field Suppressor was invented by Howard Stark specifically to disable the Makluan Rings. Unfortunately, it only does this temporarily, but it is still long enough to make the ring wielder open to attack. The second version which "theoretically it's 80% more powerful than the old cannon," as said by Howard, was used to weaken the Makluan Overlord after it was attached to Tony's Satellite.