MWG 40 Round Steel Reinforced Polymer AR-15 Magazine
Updated: January 9th, 2013
MWG is selling Bulgaria manufactured 40 round magazines for the AR-15. They are polymer reinforced with steel. They cost $25.95.
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The larger the load the more stress the spring have to endure. That means the spring will wear out faster. Sooner rather than later the spring won't be able to keep up with the firearm rate of fire. That translate to failure to feed issues.
It also means that it is easier to damage. Dropping a near or full load to the ground might damage the magazine due to the greater weight.
Seems like a poor value when a quick web search yields 40rd Stainless mags from C-Products for as low as $9.95...