Rock Island Armory firearms have always been tough and durable. Now, select models are entering an entirely different league. If you see the Armor Series icon, it means that model is available with a diamond-like carbon coating designed to drastically increase reliability, durability, and performance. This isn’t a spray-on coating that will eventually wear off. Armor Series is an advanced surface treatment that applies a clean, dry lubrication that results in permanent hardness while eliminating the need for oils or greases.