As you know, one of the worst issues with shooting PCC is the inability of the plastic mags to perform consistently. MBX decided to take the problem head on and developed an extremely strong steel Glock style magazine. They improved the reduction angles and added a second stage near the top to maintain a fast and consistent “nose up presentation”. They then engineered the body of the tube to correctly stack, align and feed 9mm tapered cases. The tubes have been heat treated and tempered for consistent performance and durability. The base retention lips are infinitely stronger than the plastic and will not fail when you need extreme durability.