Not impressed - DoubleStar Lower Parts Kit M-16

I bought this kit for my M16 registered lower receiver. Not knowing the history of the lower I thought I would just be safe and replace all the lower parts. As I replaced one component at a time, I noticed that my old parts looked better made, were heavier, and more solid than the new ones from this kit. The hnew fire control group would not even function properly once installed. I ended up putting the old parts back in and it again functions perfectly. In the end, I only replaced the mag catch and a few springs. Expensive mistake. I should left well enough alone.