Polymer receivers, like the ones from Tennessee Arms, can be the subject of some controversy on internet forum boards or out on the shooting range. Make no mistake, these products aren't plastic toy guns. Tennessee Arms, one of the industry-leading manufacturers of polymer lower receivers, is so confident in their product that they stand behind them with a lifetime warranty. With a guarantee like that, it's easy to see why more people are giving polymer lowers a chance to prove themselves. Some of the biggest benefits of polymer lowers are the fact that they're incredibly lightweight, cheap to buy, and due to the fact that the colors of these lowers are inherent to the material, you'll never scuff the color off like you could with coated aluminum.