Not long ago the ProMag line, which are made in the USA, did not have the best reputation. And for good reason, they were cheaply made. The company got the message and has come up with AKSL-30 which is a metal reinforced polymer magazine. They even sent a couple to ‘Rob Ski’, the notoriously brutal blogger who flogged these items unmercifully. The result was a thumbs up. Even a tough critic like Mr. Ski was impressed. They are manufactured with a high-strength poylymer that has metal reinforcements for the front and rear locking lugs as well as the feed lips. The body of the magazine has an aggressive, tactile design that provides a positive grip. There’s also a section to fill in with a paint pen to mark the magazines. Comes with the ProMag Industries lifetime warranty. I think these are a good bet and for around $20 the price is right.