FWIW: I am happy with mine, but I am a noobie. I am guessing you have a stripped lower? Others are around who know much more than I...what did you pick up for a lower parts kit?
If you get a Spikes lower make sure it has the KAI prefix on the serial number. Spikes gets their lowers from several manufacturers. The KAI prefix lowers are made by Kaiser Defense. My Spikes KAI lower has the best fit and finish of the twelve ARs I've owned. Alternately you can buy a Kaiser Defense lower for less Exact same lower except with Kaiser's roll mark instead of Spike's.