IMHO.. Most Polymer companies are 5+ years away from producing a lower that would be reliable enough for me to try. I wouldn't buy one without fully function testing one first and use it as I do my cheap lowers, examples being Andersons and PSA's. These become truck guns that get beat the snot out of, left behind truck seat, picked up, fired til their blazing hot and tossed in the bed of my truck for a bit just to be shot again by me or a friend at my farm's shooting range. Would any Polymer lower manufacturer put their lower through this? I doubt it and I don't even consider it abuse or torture, just a typical day out on the farm shooting and having a good time. Don't get me wrong, I have lowers/complete rifles that I'd never treat this way, and get babied but I'm not afraid to run them hard.