A.R.G.
From The Stargate Omnipedia
Technology which emits a directional energy beam designed to disrupt the connection between nanites. The handheld device, also known as an "A.R.G." or "A.R.W." (anti-Replicator weapon), is a more portable cousin of the Replicator disruptor, affecting the molecular bonds of blocks in the same way.
KEY EPISODE
The Return, Part 1 - Colonel Carter issues the first series of anti-Replicator weapons to fight the Asurans. The devices are fast tracked into service when Colonel Sheppard leads an impromptu commando team back into the Pegasus Galaxy.