Horrible customer service. I tried to purchase a DPMS ar-15 upper 20" barrel 1-9" twist. They sent me a 1-8" twist. When I asked them they said that price and specs are subject to change with out notice. I told them that I didn't feel this is a spec difference, that they show different twist for different products. Anyway I sent the upper back they said it would take 24-48 hours. It has been 5 day's. When I contacted them they said again it would take 48 hours when I said it has been 5 day's since confirmation of delivery. They have not contacted me back.