This is a factory STEEL 20-round extended magazine (pinned to 10) for the Arex Rex Zero semi-automatic (Standard & Tactical Models.)
These steel magazines are put through multiple tests to assure ever lasting service. Arex fortifies the steel on this magazine by immersing the steel to be blued in a solution of potassium nitrate, sodium hydroxide, and water heated to the boiling point. Ensuring that the magazine will last the shooter a very long time without corrosion.
The enternals of this magazine include a steel follower, and a steel compression spring to assure minimal friction and sustainability when in the field or out in the range.
