As I looked around, I found titanium, 4140, 7075, 6061 and a number of other 80% receivers. I also found something (most of you know what this means but I do not!) that was called an 80%+2% receiver. I found the list of exact screws and taps and I found the approx screws and taps to the metric ten thousandth.
I thought by researching, I would find the info that I needed to make a good start at an 80% AR lower, but I have become a great deal confused at what I need to begin the process of the lower. I do want to build an M4 and an AR10, and I really would like to know the real basics on what I need to begin.
I have found great costs on castings, but I know that a forging is better. I read that 7075 is a waste, and that a steel 4140 is what I need.
Any of the vets out there have a list of absolute do's and don'ts. I really need them. There are so many options out there that I cannot begin what I want to do without a good foundation of understanding what is really needed.
Thanks in advance for the input!