Leapers/UTG has designed the best polymer magazine that is guaranteed to feed and function flawlessly. UTG is known for its quality products and this 33 round 9mm Glock magazine is no exception. This magazine has endured multiple tests; temperatures ranging from extreme heat to extreme cold, water, dirt, dust, drop, and even a weight test. Yes, a weight test, drive your truck over it, pick it up and place it back in your pistol to continue shooting.