These cartridges are all you need to get the job done, any longer and you are going to sacrifice accuracy. The guys at phazzer really take pride in there work, even after the transaction was done and they received there money, they continued to help me and answer my questions. Most company’s forget about you after they get what they want “money”. Phazzer has a lifetime customer here, as i am very pleased with all there products and service. If you want quality at a very reasonable price, phazzer is where its at.