Rhino Arms is a St. Louis based firearms manufacturer, most known for their sporting and competition rifles. Rhino Arms advertises themselves as makers of 100% US made products, and guarantees a ½ MOA on their rifles. Rhino Arms receiver sets are made from 7075 aluminum with a hardcoat anodize, and their bolt carrier group and trigger group are nickel boron coated.
References
Rhino Arms Wikipedia(Text) CC BY-SA