C Products 5.56 30 Round Aluminum Anti Tilt Magazine has a lightweight aluminum design. The magazine is constructed from 6061 temper aluminum. A plastic anti tilt magazine fees keeps your bullets cycling vertically and reliably for years. At a weight of just 4 ounces, the magazine is considerably lighter than its stainless steel alternative. The improved interior design allows more better stacking of rounds and more efficient cycling, which makes it the best magazine on the market.