"Steel alloy sight designed to reduce overall weapon weight by three ounces. Weight reduction results in less fatigue and faster target acquisition when aiming down sights."
Armat S7 Alloy Iron Sight description (from Aliens: Colonial Marines - Arsenal Upgrades - Armat M37A2 Pump Shotgun - Armat S7 Alloy Iron Sight)
The S7 Alloy Iron Sight is a modification manufactured by Armat Battlefield Systems for M37A2 Pump Shotgun.