The testing has been very extensive firing 20,000 plus rounds. The MAG47 has proven to be extremely reliable. We also worked extensively with manufacturers to make certain this magazine fit into every rifle we could get our hands on. The MAG47 lives up to the renowned reliability of the AK47 platform. Technical Specifications Stainless Steel reinforced feed lips and locking lugs Super tough composite construction Fits most AK47s Spring anti-bind mechanism Stainless steel spring Quick release base plate for easy cleaning 30 round capacity